[bbartlog]

I don't understand the problem. If I understand the hand history right, you still have the high nuts on the river (no flush, board pairing, or higher straight possible). I'm not sure about the turn 3-bet, since someone else could have 75xx and there are surely redraws to a better high out there; but 5-handed I think I do the same thing. Equity may be hard to gauge but I can't imagine it would be below 20% on average.
Seems like by the river you should love your hand, having dodged all the flushes and board pairings. Did three people have 75xx or something?