I don't trust bow shops anymore. Even the one I had gone to and got good service. Tune it yourself. Sounds like the rest is off. So let's begin there.
Go to the hardware store and get a vernier caliper. If you don't have at least 2 levels (for perfectly straight edges) buy them or borrow them. Clamp the level on each side of your bow limbs where the limbs bolt to your handle. Before we move on, would you agree the string aligns with the very center of your handle and that the bolts holding on the limb also aligns with the very center? If that answer is yes in your mind, why shouldn't your arrow also? The only reason it won't is if the rest was off. With an arrow already knocked, take the vernier caliper and measure the from edge to edge, arrow to each level, and adjust your rest until both sides equal. If you have doubts to your knock point, go buy a bow tee from a sports store. They run about $12 and with this and the above setup, you can be sure your arrow is coming off your bow perfectly.
You would be very surprised if you actually took a few bows at random that supposedly just got tuned at the shop and are way off.
Last edited by Fieldmouse; 11-13-2010 at 06:34 AM.