So I picked up my 2012 Giant Glory 0 this past weekend and I'm going through the process of setting it up for my weight. I've been reading a lot online about the head angle on the Glory not being "Slack" enough for serious DH? Well for 2012 Giant sent out the bike with the optional headset bearings to alter the head angle from the factory 65.5 degrees. It gives me the ability to move the head angle 1.5 degrees either direction. So my question is how should I set it up and why? This is my first pure DH bike so I need some guidance please.