I'm trying to resolve an under extrusion issue on my top skin layer. I have gaps between the skin extra wall and the part walls. I've discovered the extra skin wall flow is actually controlled by the top/bottom flow and not the skin flow. Skin flow affects only the zig zag fill portion of the skin layer, not the extra skin wall that borders the part walls. I need to increase the flow to the extra skin wall and not all the top walls, otherwise it will cause me over extrusion.