I have the same bike
I have the exact same frame; same size, even same color.
I also have what would be viewed as a significantly higher saddle relate to bar position, but that may be because I have a lot of time on the road.
I am 5'11", 32 inseam, and ride aggressive XC on typical Eastcoast rocks, roots.
I agree w/ TNC that Kirk's recommendations may be too much, based on the starting point and my experience. Definitely move the saddle forward a bit, and up as mentioned.
With the bars, move one or two spacers from below to above the stem. Ride it and adjust as needed. I did one, then another, and think I am now just a hair high.
On fast, rough descents, drops, and log piles, there is a definite increase in stability. I think it a a combination of both the rolll over and the slacker angle, since the BXC HA is a bit steep. (Thx Cpt. Obvious!)
There have been several cases where I think the 650B front was the difference in keeping me from going over the bars.
On the other hand, I rode at a place that had extremely tight, twisty singletrack (tight to the point of having to have an eye on each end of the bar to make sure it fit between the trees) and the front seemed a little less manuverable.
I am not sure how the guys on the ride w/ 29ers were managing it...they were behind me
Anyway, until that ride, I had ONE instance when trying to get around a tight rocky switchback that I wished I had the 26" wheel on the front. As my friend pointed out - if it is a significant improvement 99.44% of the time, well that is a no-brainer.
Good luck. Report back on how it goes.