I think you played this fine. The only holding I worry about here is 99. TT is the best hand you could hope for in this range. I would think that QQ-AA would have reraised PF in his position to narrow the field. The only other holding I can imagine is an Ax-spades semibluff in which case you made the right move and ran into a river suckout.

A more aggressive way to play this (and a line I like a lot) is check-raising the flop. First to act with 5 raise-callers PF is an excellent spot for this. And it wouldn't look like a typical CB.