Your post is oddly worded, at one point you state, that you assumed lower PP or AK/AQ, later you state you were confident of it being a lower PP. Either way, it doesn't make a difference, just thought I'd point that out.

In that stage of a tourney I am playing flops, looking to get my money in when I have a big edge, I try to avoid coinflips when possible. You are correct in that calling is not an option, it is either All-in or fold. It's a marginal call, with marginal odds. I don't think you made any mistakes here, just caught tails when you called heads.