I like me some oxy and enzymes. I think I will get some sodium percarbonate to boost simpler pre-sprays with. I read a thread where folks were saying enzymes don't often perform well when added to alkaline detergents, but
Saiger's formulation and some others do. Not sure if that is true though.
Flushing the carpet is a great thought. Good to hear it's generally safe within reason as long as it is mitigated with extra dry strokes and fans as that's what I've been doing and I haven't gotten any bad feedback.