Was shooting last night at my Walmart target (burlap bag with walmart plastic bags inside), with fletched and unfletched Easton XX75 Gamegetter 500's, the arrows are 30" with 125 grain field tips. shooting from the 15 yard mark. I would nail the target center with one bare shaft and the next would take a detour about 3 yards from the target. On these I did get a string slap. Am I torquing the string? I'm sure the fault is mine I just can't figure it out. Any suggestions.