The delays may have been the bot base not recognizing you were in combat, I've had stuff like that happen before. Try putting Enyo in forced healing mode, or whatever it is. Also, I recommend turning all rezing off, and just handle that manually. I don't like the instant BRs it will throw out in the middle of combat lol.
As for mana intensive spells, on automatic I have noticed it spams the hell out of Wild Growth. TBH I don't like this spells rework. It costs WAYYYYY too much mana. I currently almost never use it and I notice no huge drop in HPS. Just turn it off and use it manually.
Give that a try and see if any of it helps you.
Just my $0.02