Just voicing my opinion. I agreed with your decision to tell the PCs the HP of their enemies on the basis that we could see how bad their wounds were, but I think that it's a little bit more information than we should reasonably have to know what our enemy's class and level is, at least before combat. I think it's more reasonable to have to figure it out on the basis of, say, watching him rage.
That said, you're the DM, and so your say is final.
Loving the adventure, and since we seem to be nearing the end, I'll say it again: I really hope you'll do another one of these, because I think this is my favorite PbP game on the boards.