J9s

In a vacuum, you could just check/call the Turn. Since he'll either have some Overpair and AJ AQ AK that he might be raising with. This play is unbalanced but its not as crucial since people won'T pick up on it and keep playing after their 0815 scheme. As played i would have donked this River again. Its too likely that you have made the flush or the straight now and single JT QT you won't be calling. There are not many hands he can be valuebetting against but he'd check even with AK. So donking is fine!

To be honest i don't think it is unbalanced

If you're going to check raise in a spot like this I'd check this turn 100% of the time because your Range on Range equity just went through the floor vs someone who's 3-betting a UTG open. Additionally he can still call flop/raise turn with even JJ-KK here because we don't really have Ax in our check-raising range so really we're giving away easy bets by following through here. Our fold equity is close to 0 and there's a big likelihood we get raised here.

River is very close.

Arguments for x/r'ing:

We don't have much 9x in our UTG range (12-15 combos probably)
We probably don't have a set
Flush draws are 1-off combos (we probably have about 6-9 combos of FDs)
Tx is probably our most likely hand and we have to pay off with some of them otherwise we seriously overfold this river.

Arguments Against X/R'ing

That river hits everything. We could certainly have 2-pair now even if we've not hit a straight
Our opponent's range on range equity just went down so he's less inclined to value bet so we should take the initiative

I think overall I just prefer donking here but it's a rough spot.