While I haven't removed any restrictors, I have swapped the shower head to an Oxygenics shower head, which is likely an even bigger restrictor...
What we have seen is that incoming pressure matters greatly. having the fully adjustable pressure gage with a dial helps you understand if the park pressure is acceptable for the Girard system. On a recent trip the park pressure was outstanding, but due to my water filter getting clogged, the flow went to a trickle. This caused my wife to have a really bad dance in the shower that resulted in some kind words to me to address the issue. In this case, I swapped to the internal tanks and it got her a much better experience in the shower.
Carl & Dawn
2015 Greyhawk 31FS
2015 Ford Transit Connect (our TOAD on a DEMCO Dolly)
DW, DSx2, DDx2 Catx2 Dog
Tampa Bay Area of FL