I ultimately decided to make the call as we have one of the better combo's w/ no diamonds in my hand (blockers to his bluffs). Obviously we also have AQ OTR, and AK o/s (I would typically 4b AKs from these positions) in our calling range.
Not sure if this is particularly relevant, but w/ having no K/Q in my hand, we have no blockers to his Kx & Qx (and/or KQ) bluffs which can consider 3 barrels on this board to get me off my under-pairs, although I don't see many players firing 3 barrels w/ just blockers in 3b pots at these stakes.

Thoughts about this spot OTR and my thought process?
Also, do we think his sizing means much OTR (I believe he had slightly less than pot left behind)? To me, in 3b pots this sizing usually indicates thin-ish value.

P.s. First HH on run it once - I can only seem to hide the full river action, can't figure out a way to just hide results, so apologies about that.