Playing Weak Tight in a Kill Game?

[Fitz]

I've been playing 3/6 with a full kill at one of the local casinos. I'm doing okay, but kill pots are killing me. I think the biggest problem I have is that when we go to 6/12 I get weak tight. I folded an over pair for 1 bet on the turn last night when the fourth straight card hit the board only to find out my jacks would have been good. It was a huge pot. Looking back, it would have been a reasonable call; of course, hindsight is 20/20. I'm adequately bankrolled for the game, but when the stakes double I am struggling.

I've been playing and winning online for years. I'm just getting back into the swing of playing live. I'm completely new to playing kill games.

Any advice is greatly appreciated.

Thanks,

Fitz