If you are in the middle of a print and you bump the Feedrate multiplier to 200, do you also have to bump the Flowrate multiplier? Since extrusion G1 lines contain both the move and the extrusion, I guess Feedrate would be enough, but just making sure.

The speedrate alone is enough. The extrusion is increased the same amout. Flowrate is only if you see you get to much/less extrusion and want to fix it during print.

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