I tried to do some math on how the BEP changes when he's sometimes got a hand we crush ie TT, but solving equations with three unknowns isn't excactly my strong point (help us out, swiggidy?).

As an example though, here's what happens if he's got TT 5% of the time:
89.8x + 17.95(0.95-x) + 0.05*176.75 = 69
x = 0.40
meaning that if he's got TT 5% of the time he only needs to have AcKc 40% of the time for us to break even.

I don't think this is as easy a fold as people make it out, and keeping with my thought that the flop overbet more often being a bluff or draw I think I make the call.