Change 1/2" studs to 14mm

[luvbowties]

I'm running 88-92 Super Sport Chevy chrome rims, shown below, and having problems with hitting potholes(un-missable)and knocking wheels out of round at their mounting lugs. I'm torqueing them to 100 ft-lbs.

Has anyone changed the 1971 front rotor-studs and rear axle-studs from the 1/2" to 14mm as used on the 88-92(and later) pickups? I haven't measured the conical portions of the 2 nuts, but I'm guessing I will find the 14mm to have a larger starting diameter with the same degree taper--giving a fuller/meatier fastening inside the wheel holes.

Any other ideas are appreciated.
Thanks,
Sam