Nix Goodt
I would try and have used the Champion RC9YC in similar motors on our pump gas here which is 92 U.S. octane with no ethanol. I'm around 3500 Ft above sea level so that has a effect on my results , I set the total timing to 34 degrees BTDC or less if I go down to a lower altitude to avoid pinging or the chance of hurting the motor at WOT
Where are you in Deutchland (SP)?