I suck with Pythium ... please help!

[Huzurdaddi]

You'll probably want about 4-5 communicants per theurg when you have 4 or so theurgs

3 seems to work at 4 theurgs. They die exceedingly rarely. I have not tested for 5 theurgs.

These spells will usually be things like thunderstrike, paralyze, soul slay, and such, plus body ethereal, so they aren't that useless.

Actually I see a tremendous amount of ghost wolves. Mostly when the opposing army is retreating. I do however also see soul slay and enslave mind which is nice.

Relief gets cast when the fatigue of your entire army starts to get to be large.

Really? Are you sure about this? If so then clockwork horrors could be quite useful.