Also I believe that a large mushy wall is better for purpose made back tension releases. These need a bit of movement to go off. Bows with large mushy valleys are a bit more forgiving of over and/or under draw. If you START in the middle with a back tension release, your gonna start moving out of that valley when setting off a "purebred" back tension release.
Now, if your using a trigger or quality thumb release (Like a Chappy Boss) that takes VERY LITTLE rotation to set off (trigger doesn't even seem to move...ZERO percieved travel) you are better off starting agains't the "wall" if your bow HAS a "WALL" (read most solo cam bows, and newer cams with draw stops...NOT older round wheel bows). These newer bows are not quite as forgiving to under draw (or creep as many call it) Shooting agains't the wall keeps you consistant.
I have a lot of trouble shooting my Stealth Force with my Stanislawski release. But it works GREAT with my Chappy Boss.
On the other hand, I can fire my Martin Firecat (round wheels) very well with the Stan release.
Oddly enough, I am MORE accurate with my Alpine than I am with my Martin...but that is ME.