Old post that I have to bring back to life. I had this very same issue, and all of the above input helped me fix. For me it came down to nozzle diameter, extrusion multiplier, and extrusion width. I tried everything: .4mm, 1.25, auto, .8, etc. and so. What eventually worked for me was actually going DOWN in nozzle diameter, and extrusion multiplier. .35 and .9 respectively (auto on extrusion width). Prints have never been better, just wanted to say thanks for all the input and help even years later.