Since you are using a string loop I completely reccomend a Scott silverhorn.
http://www.scottarchery.com/products/silverhorn.tpl

Lightning quick hook up with out having to look at the loop to make sure the jaws grabbed around the string and is fully adjustable for length.
High polished stainless steel hook for absolutely zero loop wear.

You might look at it and think that the hook will pull off the loop. I did too at first and had to test this several times whenI first started using mine.I can assure you that it will not come off the loop. The release has to be moved to almost a 90 degree angle to the loop before it will come off.

IMHO this is one the absolute best hunting releases for a string loop shooter.

I have the sabertooth as a back up release to my silverhorn.