I think I see what you're trying to do with the Helbrutes... You know, use them. But they really are not worth the two hundred points. Even to put more
AV on the table. I would spend those points on two predators or most of the cost of a land raider or a defiler or a Soul grinder and a half. Or 6 rhinos

just saying there are other vehicles you can spend 200 points on and I would suggest pretty much any of them except the Helbrutes.