Devastator vs. Demolisher (Harkevich List)

I've recently been playing with harkevich and his potential. I made a 75pt list with the jaws of the wolf theme, focused on devastators. I can't see advantage of demolishers, possibly anti-infantry? I see the large difference being the two ranged attacks and gun fighter. They could take advantage of Harkevich's broadside, but they seem to have weaker damage output. Gunfighter seems pretty situational, as you can't make melee attacks. Two ranged shots at power 15 with low RAT won't do to much I feel. 

Khador - Harkevich

Theme - Jaws of the Wolf

73 / 75 Army

Kommander Harkevich - WJ: +28

- Wardog: Free

- Devastator: 14

- Devastator: 14

- Devastator: 14

- Juggernaut: 12

- Juggernaut: 12


Greylord Forge Seer: Free

- Behemoth: 25

Greylord Forge Seer: Free


Kayazy Eliminator - Leader & Grunt: 5

Kayazy Eliminator - Leader & Grunt: 5

Also any advice on my list is welcome, I've only recently picked up harkevich and want to try and take advantage of his feat. ARM 26 sounds like it would be hard to deal with, makes for a great anti-alpha turn. The idea is to have the devastators carry my juggernauts and harkevich up the field and clear some room for the juggernauts to take out key targets. The behemoth/Forge seers and eliminators would be used to take of solos/flanking units/anything odd being thrown my way.

The army does not have any easy targets, blast damage will be mitigated, harkevich will have plenty of options for iron sentinel. I can see myself being a bit focus starved, but with the free charge from feat turn I plan on sending the devastators in to knock things down and reposition out of the way. This would set up the juggernauts up for easy charge targets and some reign of fire charges the following turn. I don't plan on giving the devastators any more focus than the power up.

I've thought about switching out a devastator for a demolisher, but reign of fire looks to be more useful than two cannons from the demolisher.