I found this to be very helpful and thought I'd share.  not sure if it's been posted here before, hopefully I'm not breaking any rules. The model is using a wheelie, but I believe it would be the same for trads.  This is the form I changed over to this year after reading one of G Fred Asbells books on bow hand grip.  I've found it to really helps avoid torquing the bow.  I don't use a wrist sling when shooting and am still able to keep the bow hand relaxed without dropping the bow.  Well hopefully it will be helpful to others.
  http://www.buckmasters.com/DesktopModules/DnnForge%20-%20NewsArticles/Print.aspx?tabid=135&tabmoduleid=643&articleId=385&moduleId=658&PortalID=0

Thanks for putting this, I'm gonna give it a try

Do a search that moebow posted up ( grip question ), he explains this in detail and yes it helped me greatly to say the least, if fact look up all of his instructional suggestions on shooting, i'm sure you will find them very helpful.

Good luck.

P.S.  http://tradgang.com/noncgi/ultimatebb.php?ubb=get_topic;f=6;t=005763#000010

Ditto with what njloco says, moebow's got some great videos on youtube, very helpful!