Kent Norman / Sweden

I have an older 3W B2 mounted in a CAP 232 (span 225 cm, 10 kg). I can't get it to run properly in inverted flight nor knifeedge.
Its carburator is "hanging" under the engine using a 90 degree intake. Think I have tried all recommendations with no real improvements.

It sounds like it running rich inverted and starts to spit. I'm becoming used to it. At first it scared me, but now I don't really bother.
In Arestiflying it can be a little anoing. The engine is running great, but like to sit upright, who doesent............?