Thx Havoc for suggestion. I indeed swapped him for test. So I was able to play vs my friend Legion today, run on Bethany II (CID) In the end I died to assassination by my opponent last model (he had 1 more attack). Earlier he shoot Karchev with -2 ARM, and then some shooting took almost half his life.
Some thoughts after that game: Karchev the Terrible - He doesn't do much. I think that I moved him too far in feat turn, and in the end he didn't do much. But I also find it hard to balance switching spells on him. I definitely needed "Countercharge" previous turn, but doing that I need to spend 3 focus to cast RTW. And then I was left with just 3 points. I decided to assign those to my jacks. Maybe I should left those on Karchev. But finally I think I could just leave him back, but to be honest I was worry if my only Jack in range would be able to kill his target.
Devastator  - This are always solid. Takes attention and are hard enough that opponent need to assign enough forces to kill him. Beside that it helps a lot with zone controlling. Juggernaut  & Marauder  - They were both fine. All I was missing was more focus on my jacks. I am mostly Horde player, so I didn't think about it earlier, but it's hard to fill them all with focus Kovnik Apprentice Kratikoff  - Yeah she is definitely great, because of Boundless Charge you can cast twice. This helps a lot this army. Rager - Well he did nothing this game. He was able to shoot once, and he missed (expected), but I know that reason for him is to have Shield Guard. I am just wandering if cost is not to high for that. I am wandering if it wouldn't be better to just put into the list one of the cheep models like Mad Dog or Berserker. Yuri the Axe [0(5)] - He was fine. But vs Legion his Stealth is useless. He was able to charged once with thresher and do some damage. In the end he was fine. I lost him to early. Could play him more defensive way so he could perform better in turn when I am using RTW + Feat. Kayazy Eliminators [0(5)] - I could say the same about them as about Yuri. First unit dissapeared because nothing else was in range of Legion shooting units. The other do some damage to caster, and he lost turn trying to kill them, so I will call it good. Battle Mechanics (min)  - not used...
Before next game: I definitely need some easier way to trigger RTW, so I was thinking Widowmakers. Also I had a lot problem with focus. So I think I could add Malakov as a mini-caster and assign another Jack to him.
If someone has any more suggestions I would be thankful.
So I swapped out 2x Marrauders for Malakov + Spriggan. It's one lesser Jack, but I like the fact that this combo extends my threat range, and enable RTW. With Malakov upkeep and Boundless Charge from Sorscha, I am able to get 13", so that's maybe not great, but solid. And after upkeep I should have 3 focus on him and free charge. So he is can make some damage (and can shoot some low def models too).
I also switched Yuri for Greylord. I like Yuri, but I still think that additional focus would be handy.
I also have gone back from Rager to Marauder, because from my experience, I was able to left Kratikoff in save position.
The last thing I'm considering is just to replace Mechaniks for another one Greylord. I don't want to replace Kayazy, because they are at least units, and I can use them to score sometimes.
Bethayne 2 has Dissolve as a spell Dissolve 2 6 – – UP No Target friendly Faction model’s/unit’s ranged and melee weapons gain Withering Death. (A model hit by a weapon with Withering Death suffers –2 ARM for one turn unless it has Immunity: Corrosion XICONX.)