Capacitor substitution question

[glynnw]

I recall this being brought up a while back, but a search of the old forum didn't bring me the answer.  Has anyone replaced the .22 uF caps on the Shunt Regulated Active Load PC Board on the Extended Foreplay and if so, was it an improvement?  I know sometimes PJ says don't do it, so I want to ask first.

[Caucasian Blackplate]

There is some positive sonic difference to rolling that capacitor, but they aren't nearly as key as the coupling caps.  I know Auricaps will fit reasonably well.