Just retain the ability to change gears. if you get to the point of being the overlarge stack at the table and are on a heater, run with it. No need to engage in large pots (unless your junk flops the nuts of course!), but if you can enter cheaply, speculate away as long as it's early and the blinds are low. Don't start calling large bets to chase just because your 9,4 was suited or you hit top pair and the raiser pre is pushing hard. Once you stop spiking flops with garbage (as that's what any "speculative" hand really is) stop playing them and switch gears back to your normal game.