opens 63% otb
otherwise small samples
whats my line here

2 options I considered:
1) bet fold small
2) check call a reasonably small bet ($2 and less - or smaller )

I usually bet unless he's shown me that he can xback an A, but then again he should be checking it on the flop and not the turn so...
He has plenty of hands that will call us at this point and its safe to say that even if he has an aces its the A2,A4-A5, A7-A9 only

Gutshots probably bet turn as well, which kind of kills KJ,KQ but then again he probably has almost all Kx ( except K2-K5o or smtng) and 8To+ 7Ts+
We can potentially gain value by Kx and Tx depending on the bet

I think the air we have here is pretty much 78,79,89. If we think villain doesn't check back value on the turn we should be valuebetting all our aces. With a range of A2-A5,A7-A9,KT (90 combos) for value and 79,89 as bluff (32 combos, keeping 78 as a bluffraise to balance with sets) a GTO betsize would be about 55% pot. If you think he calls too much you should bet bigger, and bet smaller if you think he folds too much.

Should keep a couple Ax hands in cc range for our worse kings maybe? (KXs XX DD HH I'd cc on the flop) or is there no need

But yeah like betting with pretty much all our range - good point that I have very few hands that will check fold

One thing tho - I looked at these spots
here
https://www.liquidpoker.net/poker-for...bet,_Check_line_OOP_River_range_.html

And came to the conclusion that best hands to check raise along with some nt are hands with SD value that can't call - here a weak Tx should be a great candidate for a check raise with sets right?

I've been using that strategy ever since pretty much, works out well so far

I think having a checking range of just Kx and Tx is fine here because villain's range is capped from checking turn. If he decides to go wild on this river we can adjust by slowplaying sets and then c/ribg polar rather than valuecutting ourselves here.