I would cut this part small and just print wing tips with a few hexagons as a test piece and do lots of tests.
Brassfill is difficult to print - it has so much brass in it that it doesn't stick to itself as well as typical PLA.
First thing I would change is to get all your speeds the same. Having an outer wall speed different than inner is asking for trouble. They will have different pressure in the nozzle and it takes a few second to switch to the new pressure causing over and underextrusion and those gaps in your top layer.
higher flow sounds great. Keeping printing speed under 30mm/sec will help. And keep travel speed fast like 250mm/sec. Having more top layers will help also. You might not need much fan since you don't seem to have any overhangs or bridging. Not sure. Fans can also help top layer bridging over infill. So I suppose make sure fan is at 100% by the time you get to the lowest hexagon top - meaning whichever top of a hexagon is lowest - you want fan at 100% by the time the nozzle gets to that Z height.
you can try to set the flow a bit higher like 105%-110%
or set the line width to 0.35
change one setting at a time to see if there is a difference, don't change everything at the same time. It is harder to evaluate what makes the difference..
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