Thanks for all your input, I appreciate it. I've always had above average flexibility in my hamstrings but my quads/rectus femoris (femori?-plural) have always been extremely tight. My old ART/DC told me I had the tightest quads he'd ever worked on. This also impact my IT band but that's something I've been dealing with for some time now.
Allen, thanks for the vid. I'm not sure I want to know what an "ass expert" is all about but I'll give those X-band walks a go.