I am going to be needing a new cam for my Mathews LX, I expecting in the 28"-29" draw length range. But I have a certain question, since I just started shooting with a Kisser Button, how do I find out my actual measurement? I never use to shoot with a Kisser Button, and my draw length was measured by where I held the release, which use to be at the corner of my mouth. Do I tack on an 1/2"-1" more the the draw length?