Originally Posted by corners
The stiffest copoly on the market is Revenge, so that might be worth a look if you're coming from Kevlar. The best in terms of tension maintenance is 4G, by quite a margin too, and that one is fairly stiff as well. Since it holds tension so well it will play stiffer for longer than other copolys.
Signum Pro Poly Plasma, and has been for years. 4G isn't even close in comparison.
Also, Revenge is discontinued.