Have you tried textured or geometric polys? I've had good luck with SP Tornado, a heptagonal textured poly that holds tension really well, especially when you mimic the Fed setup (nattie main/poly cross). Expensive with the nattie but worth it if you don't shred it quickly.
"I am also like Federer, but with a better backhand."...sureshs
Federer: "I am like sureshs, but my San Diego 4.0 NTRP backhand is weaker"???