You may try backing it away from the shelf so it just barely clears it. That is how my Trophy Takers work. You can see a pic of it in the link as well as an arrow cradle I make and sell for fall away rests.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=009&sspagename=S TRK%3AMESE%3AIT&viewitem=&item=19008219996 6&rd=1&rd=1