preflop:
at BU I think offsuit KJ is better folding. Multiwaypot you won't be able to extract value from your hand unless you hit the straight. Also at CO vs UTG+1 open TT is too loose hand to 3bet. However if you're saying that he's going to 3bet TT because you know him and you know the table, then yes I respect your read.

flop:
I believe call is good. Raise is also an option with the intention to give up turn/river (you can continue bluff with T that has suit different with any suit on the flop(if flop is QhQdTs, JcTc is good to continue barreling as it blocks QcTc)

turn:
Bet is good decision. although I'd say it's better using bigger size. If you had AQ,QTs,TT on that spot, would you really be betting that small? Still I understand your intention, so if you think that play will bring you profit, then you can be keep playing like that.,
Facing raise, it's really tricky. In position generally, you want to have hand that has no showdown value but "more potential" than marginal calling hand that you'd bet and try to take down the river if OOP players check the river(floating). However in this case, KJ is not a good hand to call as it has less potential than marginal calling hand(weak Qx) while also working as less effective blocker than Qx. If he really doesn't have TT, holding a Q is really important as it blocks around half(on QhQdTs flop, Qc blocks more than half, Qs blocks less than half) of his value range, so I think you're folding your draws and calling with Q. If he has TT, then you're still only calling with Q, because in addition to blocking decent portion of opponent's value range, against his value range you don't have many outs(against FH drawing dead, against AQ drawing 4 cards, (KQ) 8 cards). Also even though you hit your outs you are not really confident about your hand. Meanwhile if you're holding something like QJ we draw to more comfortably strong holdings, more often(against TT drawing 7(1+3+3) cards(QJ3), against QT drawing 5.5(3+1+1.5) cards(JT3), against AQ,KQ drawing 6(3+1.5+1.5) cards(JT3). So Qx has even more potential than KJ on the spot. So it looks like fold is correct play.

river:
If called on the turn. Fold is good, Qx is better as both bluff catcher and bluff raise.

*If you ask me can he be ever bluffing in that spot, well of course technically he can, he can do everything you know. He may have 84o. But practically, I believe people are underbluffing with that line - if only you bet bigger. Players do like to bet - check raise with big holdings as it's always cool to play 'it' tricky, but there're less number of people who are tricky enough to balance it out with bluffs. However, what could've happened in this specific situation is that good Reg just stabbed the flop and gave up the turn, and smelled weakness from your small betsize and took down the pot. So I think regarding he's good regular player, he could be bluffing against your small betsize.