Usually poly mains will snap back into place with syn gut crosses. I have had good experience using poly mains with Volkl and Gosen syn gut crosses. You may want to experiment with different tensions for the mains and crosses until you get something you like. Using a lube (silicone, wax, etc) keeps poly strings sliding. But, I suspect the lube decreases the string-to-ball friction. Another option is to use Ashaway Monogut ZX in the crosses. ZX acts like a syn gut, giving a little extra power and comfort, but is very dent resistant and keeps the poly sliding for more hours than does syn gut.