I don't post alot but read alot of these forums. I know somebody here can help so here goes. I have stock bore cubs, shearer in frames,35mm pwks,vforce 3,18cc domes with 180psi,vp 110, +5 timing and live in ks. I just got these carbs and have 162main 50pilot cel needles on middle clip. It bogs a ton and have to down shift alot to keep rpms up. adjusting the air screw doesn't make much difference. I was at a 55 pilot and 170 main. seems like it has no low or midrange. when It hits power band it screams. maybe higher octgane fuel? different needle?If you can help please chime in I can't find anyone with a similar setup. Thanks.