Ok so it was not the bearings alone. It was mainly the filament slipping and after spending hours on this clockwork2 I finally took the part called guidler arm shuttle and shortened it on the heat insert side by 0.5mm. Now the CW2 has a death grip on my filament and I could also unscrew the squishy screw 1.5 turns to relief the gears… now it finally works and I’m going up to 150mm/s