If you have a huge chip lead, in comparison to the rest of the players at your table, then you should put pressure on them during the bubble. You can afford to move in with anything and everything. Think of all those times you were the short stack during the bubble and the chip leader was going crazy. Did you ever call him down without great cards?
If your chip lead isn't huge, then you should pick your spots better. Widen your range, especially from late position. You can afford to 3 bet unopened pots with anything and everything from the Cutoff, Button and SB. Depending on your stack size, either 4-bet or 5-bet from late position, if there is one limper. Always make continuation bets(half pot). If they haven't hit the flop hard, they will fold more often than not. You don't even need to successful every time with your c-bets in order to break even.
Hope that helps. Good lucks.