great update - sounds like you've got your fins dialed in. i've only had 3 quads and never felt 'em other than a borrowed speeddialer (but only when the beachbreak is lined up good). i wonder how the DG would go as a single or 2+1 on mediocre days, especially as a light EPS to throw around. has wayne made a short one as a single? i thought i saw someone's 8'? that had a quad + 1.
I don't think Wayne has made the DG stubby as a 2+1 setup yet, which would be incredibly fun. I think the 5 Future boxes offer much more versatility for a shorter board.
theROOSTER has the 8' DG, which is a 4+1 (the pickle got the color from the deck of his board). I have a 7'2" DG, which is also a 4+1. This is where the stubby originated from.
I ride my 7'2" as a single when the waves are semi-hollow and fast, the board flies in the pocket. As a DD, I like it as a quad.