Curious if this is a mix fold allready OTT? Im pretty sure it's never a fold vs an optimal player/solver.
But BB vs MP/EP defently tend to 3bet too tight, and given that we are 350bb+ deep, i dont think it makes his 3bet range wider.

Second thing to my defence is that TT block TJ,T9s, that are his most frequent turn bluffs- apart from that, he need to barrel like QJ/KJs or some random overcards, wich i dont se happening alot.

Not sure if this fold is acceptable, looks extremly weak, but it's hard to exploit as the spot isnt very common and im still protected+ super deepstacked.

I just RNGd this one and decided to call low frequency OTT, and probably not calling 3barrels-
I prefer also 8x over TT,99.. Because then i have abit more playability, i think i could jam 8x sometimes if i face 3rd barrel and expect him to valuebet overpairs.