I used to own a S-works hardtail and it was a great race frame. However, by saying that it was also extremely harsh, to the point of being what I considered uncomfortable. I always had a sore back after riding that bike. Now, at that point I also weighed about 220 pounds and had abs consistant with mashed potatoes. I'm sure that played a part in the sore back department. However, I also had a dually at the time (Santa Cruz Superlight) and it never caused my back to hurt.
So are you too big, I don't think so. I just don't know that I would want that bike if I weren't going to race.
__________________
I may be fat but I'm slow enough to make up for it.