The change in stall speed worries me less than what the extra 5% does to CG, and that depends on how you are loaded. But this is all theoretical only. Who in their right mind consistently schemes and flies illegally and intentionally overweight instead of choosing the right aircraft for the mission? If you insist on filling all the seats and tanks and luggage compartments in a light single, just because it might be possible under a limited set of conditions, you don't understand the basics of flight safety. And please don't fly near me.