Hey joe, I just replaced the rear springs on mine and prior to that my right rear was also sagging a little lower than the left. Come to find out when I removed the right spring, two of the leafs were broken You may wanna check yours out for breakage...the only way I found out mine was snapped is when I removed the spring, the leafs were broken right where they sit in the saddle.

I ended up going with the 5 leafs on mine and was pleased with the ride height.
Here is a pic of the results