PLO50 KK76ss turn line?

SB is the only position we can deliberately cbet wide from OOP since BB's calling range is supposed to be wide. On KBx two-toned ie. we'd cbet with a 65% freq. which is more wide than other oop positions. I'd also say that most regs are not overfolding pre, something to keep in mind. So I would bet all top-set with exception of some low frequency checks when having an additional flush-/straightdraw. There's usually still a fit-fold gap otf so we benefit from being allowed to also bluff cbet a ton. SBvsBB is quite an exception in playing dynamics.

Since you have the FD, I agree with the XR. We are not supposed to XC any nuts. The Q♠: is a bad card for us generally spoken, it forces us back to passive defense mode (check turn). Most of our turned nutrstraights would still like to barrel pot putting a polarized pressure on villain taking advantage of the shift. To balance those out, we'd also include some top-set+fd which are a ~ 4:1 mix of check and bet. So here you can go either way.

Personally I would check with the K♦: which represents the second suit randomizer for turn play (with flushdraw/-blocker any ♥ would be excluded, since it would blurr randomization frequencies and the 7♠: would be "used up" in order to determine the flop check. So on any street to hit a 66% checking frequency I'd always check ♠ and ♦ ) Here with top-set+flushdraw it'd approximate towards solvers 79% check with that particular subcategory.