QTs is a borderline squeeze against 17% open and a call. I have in my ranges QTs as a fold but JTs and KTs as a 3bet but it's not like QTs is much worse or anything. Probably sometimes +EV and sometimes not depending on the two other players and how well you play postflop vs them.

Postflop is played fine, but make sure not to always cbet Kx and check Qx. If you want to have a checking range you need to mix all kinds of hands into both lines. You can also just cbet everything with a small size like 33% pot, and then the difficult street you need to mix a lot is on the turn after betting flop.

cheers, I definitely have some combo draws that I would check raise on this board and might check raise with KK and QQ sometimes although I think I will be very far from balanced in this spot.

well played, squeeze is somewhat standard depending what type of range you prefer to play when you get called. Suited broadways is quite good, sc as well