Jason:
From the time we started consulting at Bel Air, I've been told that in club events, eight of the nine toughest holes are on the back nine. The main reason for this is that the back is a long par-34 and the front, par-36, even though they are very close to the same length.
At one of the membership meetings someone asked if I was going to "fix" the imbalance, and I said that it had been that way since George Thomas built it, so he must have been okay with the imbalance, as am I. The idea of "balance" in that manner is one of those outside concepts I've been railing against for the last few days, where someone's "ideal" gets in the way of what works best.