[benwood]

No more salt in the wound about 3rd.Let's press on.
I would raise 4th because the pot is already big enough to think in terms of protection rather than sucking in additional bets.Your position is perfect for "narrowing the field".(What an overused term.)
Even though it didn't turn out well,I like your river re-raise because you don't look a full house because(1)You didn't raise on 4th when you paired your door card.You just picked up a dropped ball on 5th.
(2)Another 6 showed up.(3)You have no pair showing.
Seats 3&4 may fold whether you fold or not after it looks like #6 hit either a Q for trips or a spade to make a flush.With either of these 2 hands,seat 6 will pay you off.He's not likely to be full because he probably would have shown strength on either 5th or 6th with Q's up.(But he didn't)