nl100 j9o

On flop its pretty high up in my range, but I dont see many hands that are gonna pay me off, I cant extract here 3 streets, and hand has good backdoors, so I check.

I think it is big mistake to check flop. hand is too vulnerable and needs protection. I dont see a scenario or villian type, when check is better than bet. You dont need allways to extract 3 streets of value when you value bet flop, sometimes it is ok to bet flop and turn and check river, or to bet flop and check back river. When you bet flop, and villian calls, you now know that villian has significantly less strong combos in range on so drawy board, and that he folded hands as KQ, JQ, JK etc which have a lot of equtiy vs your hand.

If you really care about protecting check range because villian gets super agro, then imo it is better to check 99, or AA.

On turn I call, he reps strong, but still might have many draws.

How can he rep strong here? You checked back flop, meaining you are very weak, and then he bets turn on a super drawy board.
I would raise turn with plan to check river.

river helps some combos in his range, but also there are many possible bluffs, and your blocker is good.

How can he rep strong here?

I dont know why I wrote this.

river helps some combos in his range, but also there are many possible bluffs, and your blocker is good

Do you think sb has that many bluffs in his range here? KQo, AJo, KJo arent very likely to play that way starting from preflop and there arent that many suited hand which could be bluffing like that, unless he calls lots of suited aces preflop.

since he called preflop from SB, he likely flats mostly suited hands. So I think there are quite some busted flush draws and straight draws, GS. He could be really playing like that even with just overcards or pure air, since after a reg checks in NL100 on low drawy board, he
is super capt, having very weak perceived range especially when turn blanks. So if your range is perceived to be very weak, then you can expect more exploitable play from villian, meanning that he will be bluff heavy on both turn and river.
Even if he is having unexploitable ratio on river, still you have very good blocker, so only bad case for you is if he is value heavy for some reason on river. And I dont see anything from his stats which would tell us that he doesnt bluff river often enough.