Some amount of this is unavoidable, but there are some things that may help:
- Use single top perimeters (SuperSlicer). This simply makes these infill areas a bit larger.
- Try reducing your pressure advance smooth time (I use 0.02)
- Direct drive can handle lower smooth times than bowden. Going too low will cause extruder skipping during PA movements.
- Try reducing top infill speeds and accelerations.
- UNTESTED: Some people have told me that disabling "Enforce 100% fill volume" in SuperSlicer can help. I have not yet had time to verify this.
When I am looking for EM, I am always looking at the widest areas in a given print.
You want to tune your extrusion multiplier for the areas where your extrusion system has had a chance to equalize pressure and coast at a constant flow rate.
In this example, I would primarily be looking at the circled area.
While some of this print looks overextruded, I think the overall EM is actually pretty good.
