"In retrospect I wish I folded pre flop... I don't think that would have been a bad decision at all."
the most important thing you can take away from this hand. I'm not folding due to just bad position, i'm folding because our hand has terrible flopability. if you had something like 87s, or 96s, then sure, go ahead and limp in, those hands are great, but Q2 off suit? we hit a queen are we going to be happy about it?
why are you considering the slowplay? does it make sense to slowplay here at all? no one has shown aggression in this hand, it's likely no one has anything on this board. it's a good board to slowplay on, but this isn't the situation for it. we're not worried about the flushdraw so much, since that's literally the only draw availiable to have, it just happens very infrequently. so we're betting here to build the pot, to get value from draws (however unlikely), to get value from weaker hands like pairs/kings and stuff like AQ/AJ if they cannot fold it postflop. we also want to bet because if the flush draw does hit, it kills action, it scares people into folding, that's not what we want. in regards to your bet sizing, 2/3 is fine, personally on this board i'd be betting way smaller, like 30-40% of the pot, the one main reason is i want really weak hands to call me on a board that a lot of the time no one has flopped anything good at all.
turn is a blank, all good to keep betting, i'd keep it small again, that really can't improve villians range much. betting around 40-50% of pot now and if they call, i'd almost certainly put them on kings or smaller pocket pairs. why are we hoping for folds? we have trips on a really dry board, we WANT calls! we want people to put money in when they are likely behind, we want them to call with flushdraws, we want them to call with AQ high. hoping for folds is really being results orientated about this hand (i'm assuming you lost this, haven't looked at results yet)
the king sucks, it's a pretty big part of villians range, i'd be betting still, but betting to block his bet on river/extract value from weaker hands still. so something like 1/5 pot would be great. if villian shoves we can deal with it then and there by just folding, in your spot here, it makes it really tough when we check, because we're just playing a guessing game, i'd likely fold, but also i wouldn't be in the situation in the first place.
so i'd be folding preflop here 100% of the time.
flop, i'd bet something like 90, pot would then be 360 on turn if they call.
turn then i'd bet around 140, if they call pot is then 620
river i'd bet around 140 again to block them from betting themselves. i'm not just betting this for the hell of it, it's a bet/decide. by betting ourselves, it makes it harder for our villian to bluff, so when they raise us on the river, we have to give him credit. not saying i'm just folding, but it would depend on how big the raise size was, and how many chips i'd be left with if i lost.