No real stacking system, except that I do keep my buy-in on the back-row (closest to me), once I've recovered that. I also keep my $1 chips separate & handy, as I end up using them a lot ($12 sixes & eights, "same bet"). If I start accumulating green, those go to the right of my white-chips. I never track how much I've won. If I've played for a while, & have my buy-in back, but nothing in the front rack, I've been known to take all of my existing bets down & color-out, locking in a win.