5PLO 6M. Villain is a very loose-aggressive/spewy (though semi-thinking) regular. Has pushed me out of several pots in the past. Not really sure if I'm getting outplayed or not. No HUD stats, but feels something like 60/40 (based on showdowns/observed frequencies), 3-bets widely, & pretty aggressive post. Hero likely comes off as nitty/weak-tight.

Is this an auto stack-off spot vs a villain with a bluffing range? Should I have even 4-bet pre in the first place w/ a rough AAxx that doesn't get the SPR down to 1? If I am committed @ this SPR, what is the best line post? Thanks. OTTH:

Hero (SB/$6): AA84

fold x 4, H r .15, V 3b .45, H 4b 1.50, V c 1.50

Flop ($2.70): J J 6

H x, V b $2.40, H c $2.40

T ($7.50): 2

H x, V b $2.10 all-in, H c $2.10 all-in

4bet pre is fine.No need spr to be 1 in order to 4bet AA.
Would not mind betting really small,c/call is fine.
Not too excited,but stack off situation in my opinion.

I found this situation to be quite interesting and am eagerly waiting for responses from the kings.

Meanwhile, here is my personal wall of text:

Overall situation:
We got a "semithinking" aggressive regular behind us, who is 3betting us light. He did "blast" us off pots, which may have lead to a little tilt on our side and we probably snap 4! our medium strength AA. On the flop we have a SPR of ~1.8, what do we do?

a) We can start to give ourselves a headache by trying to figure out, wether or not our opponent is going to bluff, if we check or bluff/raise, if we bet.
Since he is "semi thinking", he should be aware, that we always have AA, a hand that goes to showdown in small SPR pots more than any other hand, especially, when it is played by weak/tight players and he should also know that he has very little in the way of outs, if we indeed call him on a bluff.

Ok, he bluffs. But does he bluff here?
To decide this, we might go back through the bluffs he has shown (Or how did we figure out, he "blasted us off" pots?) and look, if he had blockers/outs and if his line made sense, i.e. if he is bluffing in a planned manner or if he just can't help himself.

If there is a clear indicator that he just bets it everytime somebody checks, no matter what, then go ahead check/call flop and turn 100%. But I wouldn't label such a player as semi-thinking, and my guess is, neither would you.

b) We can start to choose a course of action according to our range.
So let's have a look what our range looks like.
- Let's be real: We are unbalanced, we always have AA and we probably always have at least one nut suit, that's how tight we are. The vast majority of the time (assuming villain is as loose as he appears to be in calling 4bets) we will have the best made hand and our opponent will be drawing very slim.
- Other then the A, there is not a single turn that we like to see with our particular hand and range. Most of the time, our best draw will be a backdoor flushdraw.
- If our opponent improves on the turn (by for example turning an underfull say with 99x on a 9 or something), we will have no idea, that he is strong, but he (knowing two of our hole cards and being in position) will always have a pretty good idea of where he is at.

Because of all of this, I think, betting our entire range (including AAJJ) is the best play.
The size should be small (lockdown board), but big enough so that a potsized raise puts us effectively all-in.

What do we do, if our opponent raises us big?
Well, with AAJx and AA66, we getin, but what do we do with the rest? Since we want to make ourselves less exploitable, we gotta call at least some of the time with "bluffcatchers". I have no clue about the right amount (Haven't really understood how to think about "gto" minimum defense frequencies vs "pot odds" to tell the truth).

However a starting point could be AAJx, AAKK, AAQQ, AA66 and all the AA with a backdoorflushdraw, if that's not enough, we can add those with a backdoorstraight draw, too, but that's probably too many.
Going with this gameplan, I would bet/fold this hand.