Not sure of my pitch
but 5900 on runup, 6000 on climb 55 Kts
I don't run the GSC but a arplast helice?
2 strokes and associated instruments are at best a randome thing! The numbers are generally an indication,so direct comparisons are hard to quantify.
Even exhaust mods change the result(putting the exhaust back to stock length gained 150 rpm static.
Just go and have fun