The butt size on the DG's are .600"

You've currently got a +1/64" grip on your club.

Every layer of buildup tape adds another ~ .010" of thickness, and every .015" is another 1/64" increase.

So to get to 1/32 oversize, a M58 grip on a .600" butt with 1 wrap of buildup should get you there. A M60 grip will require 3 layers of buildup.