I haven't had the time yet to create a guide, but I normally just have 1 food profile, ctrl+a on all monsters to assign it to them and press start. I don't really bother with the combat/gear profiles myself. If you have a lower level account, just use a lower level slayer master. I've been using Turael since level 1 slayer without any issues.
As for the prayer, I'll see if I can replicate it. but if there is something wrong, I'm expecting an api issue. Are you using prayer potions as well?