Well Joe unfortunately it is too late to check with Fred May he rest in peace. If I had bagpipes I would play a time in his honor. 
I use a 3 point system. I insure that the barrel is in the same spot on the front bag, then check that the rear stock is positioned correctly. I typically have the most forward edge of the buttplate at the rear edge of the bag ears. Then I adjust the front rest height so the point of aim is about 6” above the bull. Then I squeeze the rear bag to bring the sights to the bull before pulling the trigger and cussing.