Laser Beam,
I too shoot a biscuit rest and have no problems tuning it. With your nock set the same position, your arrows will pass through the rest the same way every time. Search on this site for more information (type whisker biscuit in the term area) and you will find lots of products. The CAP web-page has lots of tips for tuning you rest also. You should be able to find plenty of information, as I did, from the people on this site. The biscuit is a great rest and is easy to tune. The biggest problem I had was that it was eating up my vanes, but some trimming took care of that. Good luck and good shooting.