Thanks all, I tried extending the drying time and also suggestions in other threads, in particular this Solution to printing Bambu PETG-CF with X1C (.4 and .6 Nozzle) - #28 by TheGunPsychiatrist. I switched to 0.6 nozzle, increased fan speeds and reduced printing speeds to 100-120mm/s. I also redid flow calibrations. The test prints are much better and there were very tiny artifacts but I can live with that for now