rf_jay,

A couple of thoughts that might help.

You can compensate the load regulation issues by adding a zero to your feedback loop.  If you put a small value resistor between the output of your op amp and the bondpad, you may find improved transient response.

You can try multiple bondpads in parallel to reduce the series inductance.

You can try to partition the total load cap between a small on-chip local supply, and an off-chip low impedance point.  (you may need a buffer between these).

Good luck,
Carl