Have you tried adjusting the flow ratio?
[
forums.reprap.org] :
"The only setting you need to change is extrusion ratio and nozzle diameter. Set nozzle diameter to 1mm (from what it was at 0.5mm) and then it will flow 4 times faster.... but you only need 2 times faster in reality. So adjust the extrusion ratio by 0.5 factor."
Prusa i3, Ramps 1.4. Catnozzle 0.4mm
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