c/c flop is my default although a c/r once in a while is likely ok. c/r turn is pretty double edged. Ya we can rep the 9 but the 9 is one of the worst cards for villain to barrel lite. Still theoretically we should have a c/r range here but idk this is the specific hand for that. OTR I would shut down basically always due to the above reasons.

I like the c/r, V's BTN steal range is probably wide, and we hold blockers to the straight combos and it puts V in a tough spot if he does call with a Q, which is his most likely holding to continue. So, even if the flush fills, I think it's probably +EV to fire at it with some frequency as well because we can definitely rep that on the River.

1.) I think it is well played.

2.) If he calls your c/r then I would be looking for a card thats not a spade and that either is a King or makes your straight. That is because if he calls a reraise on the turn he has probably got something that he will call with on the river with the exception of the draws. The option for me besides folding is to jam if it is a brick, knocking away all the draws and make it a difficult decision for him if he just got the queen.

You're definitely overbluffing Turn when you check/raise any gutshot, any OESD, any flushdraw.

KT is a Hand I would probably be checkraising around 5-10% and only when I have the King of spades. Having a spade in your hand gives you more bluffing opportunities on spade rivers. Maybe the blocker only adds 3% profitability to this checkraise but in the longrun these small edges are going to add up.

The only reason raising KT here is viable is that it's really Sweet If you can have the near nuts on a J river.