What do I try next?

[whitewolf]

What is nutribac, and how is it used? I've never heard of it.

Bumping up your temps and not attmpting another feed for a few days is the most imporant thing right now. NutriBac is a probiotic, most well known for being used on regurgers, but I find it works great for non-feeders too. I usually put a little bit in their water bowl while I wait to try to feed them again, but other people also dip one end of the pinky into it and feed the pinky. It works for me and for many others I've talked to.
Here is a link about NutriBac on Kathy Love's site. You can also buy it from her or elsewehre, your choice. Google "kathy love nutribac" and she has a page describing what nutribac is.