Ok. Quick 2nd post. I build my cups so that the driver is closer to the ear. In general Grado's are built to put you in the front row or even on stage. I've found that mounting the driver in this fashion further accomplishes this goal.
Additionally, it causes no discomfort and the ear pad fits exactly the same way as normal if not more flush and snugger.
This is from a set of Silky Figured Asian cups.