David –
I could understand a half inch variance in measurements just because the "top of the waist belt" is not a precise line however I think the Granite Gear guy missed it by a long shot on the large. Since my measurements for the Regular are exactly the same as my son's Vapor Flash, I suspect I'm measuring fairly accurately.
I actually like your measuring system and wish we could get the pack manufacturers to adopt this measuring system. I have recently measured my MLD Burn (my favourite pack) and it's exactly 16 inches which seems to be my magic number. I measured my Exodus and it's 16.5 so no wonder these packs work so well for me. Now that I know that I need 16 inches between your measurement points I can tell almost instantly whether a pack will fit me or not.
The Large Crown VC60 me was just silly on me. The shoulder strap attachment point was actually higher than my shoulders! Granite gear pack straps are meant to wrap around your shoulders (and use the load levelers to pull it up tight) and it's what I've always liked about their packs. The size large was so big that tightening up the load levelers actually caused the shoulder strap to bunch up!
I probably could have used the regular size Crown VC60 except that I have fairly thick shoulders (which I'm sure you do too). This means the shoulder straps have to be a bit longer to make it all the way around our shoulders and unfortunately, they made the straps a bit short (trimmed down to save weight) and the straps don't make it around my shoulders before running out of length. This puts all the weight on my shoulders which is no good. Since you are a solid guy, you might want to think about this as well. I think the pack was designed for super slim thru-hikers.
The Blaze didn't have any of these issues. The adjustable torso length and the long straps allow it to fit me perfectly. Too bad, the Crown would have been perfect for me. I do prefer the large pocket on the Blaze. It's a lot larger than the pocket on the Crown and will meet my needs better anyway. Too bad about the extra 12 oz of weight.