Btn is opening in the mid 30% region, 3 bettor has 12,5% 3B from SB.

Preflop: I think it is ok to flat 88 here. My imagination of SB`s range is 66+ ATs+, and some frequency of A2-5s, AJo+ KJs+ KQo, QJs, JTs, T9s, and some freq of 98s, 87s, 76s give or take

Flop: AQo, KQs and QJs is in my range, TT is my highest pp not 4betting cold, 77 my lowest flat.
I need to float some ATs, KJs w bd, I do not have any straigthdraws nor 2pair, I make 88 out to be a clear call.

Idea of cbetting range. Top set possibly traps, but likely villain cbets close to entire range?

Turn: villain may protect his X range with all AA-KK,, would bet Qx and possibly be imbalanced with regards to turn bluffs ie valueheavy?. Is it a spot where villain naturally strikes a good balance with his X`s because of run out?

Bet or XB. In game I thought I need to bet to charge/fold out Ax and some other missed hands that could draw out on a free turn.

River: here I am confused, what is the quality and the nature of my hand now. My gut says it is a XB and go for showdown, but do I need to make it a bluff. Would that just be speewy?