LT4363 Gate capacitor reference

On input transients in which i do not want to clamp the output voltage or trip an over current event, I am finding that the charge pump output greatly lags the jump in input voltage.  This causes high loss on the pass FET during the the event.  If I reference the gate capacitor to the source of the FET this issue disappears.  Is it valid to attach the external cap between gate and ground?

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