I have a 2010 Alien Nemesis and am having sound issues. First of all I was in a hurry and put a cheap string on it (my fault). As the string stretches I have it twisted to try to keep in in spec (34" ATA). This last time I found something odd. When I measured my ATA I got 34 1/16" (acceptable for now). When I turned the bow over and measured again (on a hunch) I got 34 3/16" (unacceptable). I remeasured several times and still get 1/8" difference in ATA from one side of the bow to the other. Is this normal? If not what can cause this?