I am playing on a site that the late reg is 2 hours and 20 minutes - 3 hours. I would say I am above average at building a stack, and my edge is definitely post flop play. I am probably on the weaker side preflop, I don't always jam in spots I probably should and tend to stay away from marginal situations i.e. knowingly racing 100 from the money and so on. 

My struggle is building my stack to 3-4x starting stack (15k-20k) in the first 2-2.5 hours and then getting hit with a lot of late reg players (usually 2-4) per table including the players still around starting stacks. With these players rejamming, and constantly putting me in marginal spots pre, leaving no chips to play post is very tilting when I can't figure out how to combat it. Assuming I am usually high stack at the table, and 1.5-2x the average, what is our strategy a half hour before the end of late registration? How much should we be opening up our calling range pre to late reg all in pre's, and what percent do we feel comfortable opening when folded to us. I usually try and stay tight through this stage, but it has been leading me to awkward spots on the bubble where I can't build when needed. Just curious if anyone has had any success with mixing styles at this point in tournaments.