OK...I cheated. I succumbed to the pressure and bought an extended battery from Verizon. I have the Verizon case with the rubber under a hard shell and cut the back so that the battery can protrude through the cover. So the hump is very minimal since the case had already added thickness to the Thunderbolt.
I am blown away how this battery is performing. If I do my math correctly, I should get 49 hours out of this battery. That ain't right, is it?