1 - I think theres a bunch of 7x and middling pp´s calling the turn

2 - Safe fold on turn, whatever check raises the flop, his bluffs are slowing down most of the time he gets called

3 - Im pretty bad at evaluating these pissing contests, I just c/f and change seat/table

4 - Im thinking of these spots more like 5 out semis rather than bottom pair and b/f flop c/f turn right away.