sets arent meant to slow play this much.. the flop call is verryyy shaky.. im raising the pot when it comes to me.. b/c anybody w/ AK is coming.. possibly KQ.. and any overpair to the 6 might see a cheap turn (which you've provided, giving them outsanding odds w/ the $4 calll.. you actually helped their decision)

waiting to the river w/ all 5 cards out there is being A. very greedy and B. will cost you far too much money in the end reguardless of your reads..smarten up.. play in your face poker and you will gain in the end.