A bow is not tuned if it is not center shot. To fix spine you need to shorten arrows, change point weight, or change draw weight. That is how you fix spine, you don't fix it by moving the arrow rest, that is simply a a quick fix. I ckeck center shot by the step back method, once center shot is set I then adjust my spine. Moving the arrow rest away from center shot (other than little movements 1/16") is wrong, fix the spine by changing point weight or draw weight.