I think when attempting to control tilt you have to find something that works for you personaly. I like useing a BI stop limit (but often have trouble sticking to it) but the exact number is something you have to decided for yourself. I just started useing a -2 BI stop limit and I feel I have saved alot of money that I would have otherwise tilted off.
I don't see why you would want a +stop limit. Provided you are playing good, focusd poker why stop. Ride your hot streaks!