Denster you are mistaken that ain't how it works...it drops the bolt head height also...I been at this for a spell and wouldn't offer a fix that I din't know would work. Besides he's already said all else has been done so what's left? It's simple thing tha most don't think about doing if they haven't tried it.
As the sayin' goes, " don't knock it till you've tried it. I've lost count as to exactly how many I've done that to but of my own Revs about 150 over the years. It's the first thing I do with a new one out of the box or new to yupo or me...