Steve,
I shoot a Hill Wesly Special , 54 @ 30". I've found that 31" to the back of the point 66-70 lbs 11/32" ceders topped off with 125 grain points work the best for me. I would think with your extra 4 lbs of draw weight , the 70 75's would be fine. I agree with the above, Hills seem to prefer heavy shafts with 9 grains per pound a tad light and 12 being a bit to much for good arrow flight past 20 yards.
As far as your hand shock issue, is your bow of new manufacture, ie: built by Craig Ekin or is it an older model? Craig's bows seem to have less shock due to his limb design. You may want to play with the way you grip the bow. I've found that if I roll my hand out slightly I get better arrow flight and much less hand shock. By out I mean to line up the proximal knuckle of the thumb more towards the center of the handle almost as if you're holding the palm of your hand on the side of the bow.
JOhn