First layer issues on travel

Hi, I’ve been printing fine on a 0.4mm nozzle and also switching to 0.6mm has been great. Now I’ve moved to a 0.3mm nozzle however I’ve got issues on my first layer when the print head finishes a perimeter and moves to the next it’s not clean. I’ve tried lower/higher temps, different z offsets and configured the pressure advance. Not sure what to try next, could this be retraction related? Extrusion multiplier? Bit lost, any suggestions appreciated!
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