AK plays OK multiway (surely better than big PP), and surely better than a 3 bet pot OOP when you will have air on the flop 65% of the time.
As for fold equity, the 8/6 UTG is not going to fold his QQ or AA combos that easily to a halfish pot flop bet if the flop is blank, and these make up a good part of his preflop 3bet calling range.
I do not mean that you should bet the flop bigger to commit yourself to call if he shoves, what I mean is that you should bet bigger to get proper value from drawing or weaker hands. The more the flop is "wet", the more draws or weaker hands are out there, likely to pay you.
The reason you are committed if you (correctly) bet 3/4 pot or full pot on the flop is not the flop bet itself: it's the preflop 3bet that causes that. If you had not 3bet preflop, it would be perfectly correct to fold to a shove or big raise after a pot sized flop bet, because the pot odds would not compel you to call. Replay the hand without your preflop 3bet, do the math and see how clear a fold it becomes.



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