I think that if you put the pin above the fingers, you might end up with little to no side weight but too much finger weight. A weight hole in the finger quadrant will give you negative side weight; I don't know if that's good or bad. I hear it doesn't matter. I've never seen weight holes directly above the fingers, but if you don't normally flare there, it might not cause too much trouble. Shouldn't need a real big one.
If you put the pin out (i.e., short pin buffer) but still 4-5" from PAP, you'll need a weight hole but it's manageable.
With only 2.7oz of top weight, you might just get away with drilling the fingers deeper or the thumb shallower (if you can).
SH