Fletch
Regardless of differing opinions, especially when based on experience, all is relevant. It is like going into a candy store with hundreds of jars of different kinds of candy to choose from. All look good, some are not good; but in the end it is the person who is eating the candy that decides which candy suits their taste.
I do not have any experience with drop-away rests, but your analysis that the rest could be a culprit -and why, sounds righteous enough to make me follow your suggestion if I was shooting a drop-away.....which I would never use...a drop-away, that is.