Devils will probably be more a gradual work in progress, because their combat routine is pretty immense and I'm more likely to tackle it in bite-size chunks. For example, having them pick better spells specifically to deal with psychic vampires might be one small chunk, since that seems to be a big problem. Picking slightly smarter spells in cabal raids might be another. Picking maledictions more likely to land or cripple the particular opponent will be another. Dealing with multiple opponents of the binder more effectively will be another. (That one is going to be fun.)

It's harder to write good AI for devils than archons in my opinion because if you're beat up, heal is always a pretty good archon option. Fighting battle berserker? Heal sounds good! Fighting a scion invoker? Heal still sounds pretty good! Because a devil's more built along offensive lines it's harder to have a good default right answer.

You've got more suave demons; it's a good start. This'll be coming along down the pipe, and maybe a little fun with angels after evil's a little more straight. We'll see!