G'day Melkus,
Here's the same settings I have on my GMS 47. But remember I am at near sea levell, so they can differ if you are at a higher altitude so some fine tuning might be required.
High speed needle 1+ 7/8 turns out from closed and the Low end needle is at 1+ 3/4 turns out from closed.
I also run 10% nitro with coolpower not castor.
Good luck ..