So both bu and bb are regs around 23/19/10, so not that laggy, but both have showed up with weird bluffs on ocasion, I have no particular reads though.

So playing these flops is tricky imo, since hand strenght will be changed drastically on a lot of boardrunouts. I usually bet around 2/3 pot here with a somewhat polarized range and have a significant checking range, protected by some strong made hands and FDs. Lately I
am experimented with a smaller cbet sizing, making it more attractive to cbet for A5/77 type hands, AK/AQ BDFD and FD's as well. Basically cbeting my entire continuing range for a small sizing.
What I like about it is that protection is very important on a board like this, and both ranges will have misdsed a decent % and so protecting/semibluffing for a small sizing is attractive to all our hands that have some equity. What I dislike is that we become somewhat open to raises.
Explowise, since this is a strategy that my opponents have not seen me use before a lot, I am not quite sure if they give me credit for a balanced range or think that my sizing means weakness.

So on the turn, facing two callers I would check my 77/88, maybe also 99, but I think that JJ is strong ennough to valuebet again. I wanted to size such that bu is in a tough spot with JTss or 77 himself. Thaughts?

Imo bu should not have 55-22 in his rangee, given that I opened utg and both blinds are agressive regs, BUT I do see regs, especially the 23/19 variety flatting those a lot nevertheless. So my guess is this villain has them quite some. I guess he continues otf with all PPs, all FD, all AQ and some AJs.
So one thing I want to ask, is what you guys think explo wise, if you think that a somewhat standard reg will just not read much into my sizing and raise a balanced polarized range on the turn, or rather raise some thinner hands for value, like QQ/JJ/TT, and/or bluffriase more JTss/AsQx type hands.

So fold because it is probably towards the bottom of our valuebetting range on the turn, or call, because he reps little and we get a decent prize? River action on blanks?