dwarf problem

Zerkova's clouds can be supplemented by kodiaks/ternion to get more coverage; trampling before dropping cloud helps. Special note to any caster than can give kodiaks reposition 3 (karchev/malakov/hark), which lets them back out of their cloud.
You might also look into the irusks in WGK. Blast immune winterguard, sac pawn, and team rocket outranging most of his stuff should help a lot.
Vlad1 probably works as well; superspeedy jacks, wind wall, and the rockets/rifles having the range advantage.

What's their list?

So, the issues are:
(1) Lots of blast damage, which on one turn will be boosted;
(2) High base POW shooting (15 for the BE, 14 for Madhammer and Mortars - but Mortars get Brutal Damage on direct hits);
(3) Reasonable melee in the Forgeguard.

Weaknesses of the Madhammer list:
(1) Only the BE has pathfinder
(2) Melee ARM cracking with only one melee heavy. The Forgeguard aren't bad at it, but struggle against Khador jack armor unless they get the charge and/or are Primed (but Primed drops their ARM to a very manageable level)
(3) Stealth mitigation - only one model a turn via the BE. Obviously that model can be the target for an AoE, but once the destealthed model is killed, no more targeting. Kayazy models might be useful if you protect them from blast damage (Iron Flesh or Solid Ground) 
(4) Madhammer only has one shot a turn (one reason he will almost certainly be better in the Irregulars theme)
(5) Low DEF (they are dwarfs) - almost anything Khador has will hit without needing buffs. So Bear's Strength WGI can trade favourably with Forgeguard.

Based on that, and what you have mentioned having in your collection:
Irusk2
- Solid Ground protects a large area against the blasts
- Artifice of Deviation gives you an on demand effect to slow down melee threats (as does his feat - Forgeguard only charge 4", and that's before the rough terrain).
- Energiser can speed up your battlegroup
- If you want a bit of firepower of your own, a Fire For Effect Mortar is a very powerful direct fire piece and if any Forgeguard are Primed, drop a shell on them - POW8 boosted will easily take down their max ARM of 16 (only achieved by helpfully clumping them up) in that circumstance.

You need to use your favourable melee threat ranges to your advantage.

Legion of Steel might work, keeping infantry in Irusk's control range for Solid Ground. The aim here is target saturation - does the opposing list have enough anti-infantry firepower to take out all the warriors? For Madhammer that depends on blast damage, so doesn't work against Irusk2. Uhlans can run outside the Solid Ground bubble as blast damage isn't a major threat to them.

Alternatively, go for a non-theme list. Your WGI and/or Kayazy Assassins (if you have them stay closer) to Irusk2. A unit of MoW STs with Kovnik can afford to be outside the Solid Ground bubble and just keep moving forward (slowly) in shield wall.

In both cases the Uhlans/MoW are vulnerable to direct fire, but there's not much you can do about that.

For jacks, quantity is more important than quality. Shooting is less effective against high ARM than melee. Other than the Rockram, the best this list can do is boosted damage rolls on feat turn, but starting from a lower base POW than melee weapons. On feat turn, a Horgehold mortar will do 8 damage (average) on a Khador jack. Both of them will take off half the boxes. The BE could just about finish it off. But that's just one jack, from most of the shooting. If you have enough jacks, some will get through. Some mechanics sheltering in Solid Ground would also help, as they can keep the jacks repaired for as long as possible.

And make sure one jack is a Marauder...

That's one thing that hasn't changed in Mk III.

What has changed is that now the Tactical Arcanist Corps is also vulnerable to that.

Thinking about it, Widowmakers may be a pretty general answer to Rhulic infantry units. The only ones with multiple wounds now are Herne & Jonne (single 2-man character unit) and the Ogrun Assault Corps. At 12/16 with Tough, the OAC is not terrifically happy to see RAT 7-8 POW 10-12 Snipers, since Sniper models get to ignore Tough on their targets.

Widowmakers are vulnerable to blast damage, though. It's probably worth being cautious using their full range and Swift Hunter from the Widowmaker Marksman to keep them safe.

ill try something next time,

Irusk2
-Behemoth
-Destroyer
-Destroyer
-Destroyer
-Destroyer
Forge seer
Forge seer
Kayazy Eliminator
Kayazy Eliminator
Widowmaker Scout
Widowmaker Marksman
Min Battle mecanic

alot of range support no blast dgm and infantry killer and energizer, FFE sound good to me. i donesnt put jack on the forge seer because i want them to get energezer and magical and blessed arent useful again them and i dont think ill use battle lust n&way

That's...a lot of Destroyers.

The general idea looks sound.

Putting Destroyers on Irusk2 or the Forgeseers isn't an easy call. Energiser comes from Irusk, but:
(1) FFE can be placed on a non-battlegroup model. On a battlegroup model it partly replicates the power-up focus, so is arguably more efficient on a non-battlegroup model;
(2) You've ignored one of the big benefits of marshalling - the general jack marshal rules. On a Destroyer, if you can aim (not too hard with RNG 14) you can get the ranged attack up to POW16 (and add FFE, or Empower from the Seer, to boost it further). If you really want to, you could even hot swap FFE between two marshalled Destroyers every turn.
Also worth nothing that it's also possible to get a marshalled Destroyer to P+S19 in melee, and anything which can make a jack as powerful as a Juggernaut bears serious consideration;
(3) Marshalling a Destroyer gives a relatively autonomous module which can spread out from Irusk (something you mentioned as a problem earlier). Just cast FFE Turn 1 and then upkeep.

I've marshalled Destroyers in JoW lists and liked it (using Zerkova1 - Irusk2 should be better). It's certainly not a simple decision.

And if you get the chance to Battle Lust a unit of Eliminators and get them to charge Madhammer, take it - the odds of assassination are not terrible.