Dominions are bad in that configuration. Don't need vets, you don't need faith in the army for anything but defense really, and 2xflamers is all you need in those squads. It's not like you are going to get a offensive faith off with only 6 dominions, so strip the 6th dom, the vet/book, and 2 flamers.
Extra armor is kind of pointless. It's only 1 result on the damage chart. It's cheap by itself, but when you add it up across multiple vehicles it adds up. Same thing with dozer blades on the exorcists.
If you are planning on fighting in
CC with your Canoness in a retinue, you probably should pick up a
Inq's Land Raider and a full squad of celestians to do this. Otherwise, toss it out. You won't win
CC with this squad. Same with the inferno pistol.
That was my advice to stjohn when we worked on that list. It's been a PITA ever since
lol.
I don't think I've beaten it yet. I really should one of these days, but he's cunningly found a real life excuse to avoid me for a couple months.