Infill width over thickness : affects perimeter as well as infill. good job ... naming that one.
Feed rate : can't turn that up, makes curves render poorly
Flow rate : can't turn that down, motor wont have enough torque
but, there is aPerimeter Feed rate over Operating Feed rate
Perimeter Flow rate over Operating Flow rate
so.. if I want to change just the infill feed rate, I can speed up the global feed rate then apply a correction here ? Lets try it.