Overextrusion at infill, underextrusion at the perimiter

Hello, I am trying to get my ASA CF working but keep failing for some reason. I am using a CHC Pro with a TC 0,6mm nozzle and I am using elcos printing profiles (https://github.com/elcojacobs/superslicer-config), who has the same setup but uses an orbiter 2.0 instead of my LGX. As a result I lowered the retraction speed to 40mm/s - everything else is identical (including the PA of 0.02) However, I keep getting overextrusion at the infill with his EM of 93,5%. The attached cubes have 93.5%, 92.5%, 91.5% and 90.5% EM. At 90.5% the infill starts looking good, but then the perimeters show signs of underextrusion (gaps between them). I would be very greatful for any suggestions. Drying the filament at 70°C for 24h has not really improved things.