My estimating of the 100z population's range here:

AA-QQ (15) discounted 50%, so 7.5 combos
JJ (1) discounted 50%, 0.5 combos
J9s (1) discounted 33%, 0.66 combos


TT (6) discounted 50%, so 3 combos
97s-A9s (17) discounted 33%, so 11 combos
As6s 7s6s 6s5s (3)
88-77 (12) discounted 66%, so 4 combos

So you lose to 8.66 and win against 21. The problem with going for a tiny size here is that people are smart enough to know you wouldn't bluff for 1/3 pot. I'm generally inclined to think that if you can't justify a half pot bet in this spot, you shouldn't bet at all. His QQ+ hands are likely above the cap of your range that would bet only 1/3 pot, so they could theoretically find a check/raise, which is a pretty big disaster for you if they're capable of balancing those raises with a few bluffs, causing you to lose your bet plus the whole pot when you fold the best hand sometimes.

With a solid 70% equity vs his range, I think I find a decent sized bet here of like 24, and I'd expect him to defend quite a bit of his range to it when the double flush draw bricks off.