lefty, what sounds high to you..?
In an off label type layout, i.e. CG leverage, pin 4 1/4" from PAP, you will lose about 3 oz. top. On a standard label drill with no balance hole, you'll loose roughly 2 1/2 oz. top, depending on your finger sizes.
With less revs, you will need a bit more top, more side weight and a stronger pin and/or CG placement to create more flare and more reaction down the lane using symmetrical type cores. =:^D