Tom,
I'm sure you have held the riser and felt the grip , so you have already discovered the secret as to why Brian's bows shoot so well, for so many.
I'll betcha 100 bucks you can't find a way to grip the bow any differently from the last 50 times you picked it up, even if you're thinking about it and intentionally trying to grip it differently....you don't really have a choice.
It did, and still does amaze me that something that simple could make such a big difference.
I can't wait to hear your thoughts after you shoot it a bit.