Bad news: replacing the wiper motor didn't fix my windshield wipers being sluggish.
Good news: in swapping the motor out I learned the linkage was corroded and partially seized on one side (the motor must have some serious torque to move it at all).
Lesson learned: Don't skip troubleshooting steps. Next time take the moving parts out, and try moving the pieces that should move to see if they move and if they don't move at all then thats probably the problem, and not the thing that makes them move.
As usual in fixing something (twice, because diagnosis is hard) I have yet more respect for car mechanics and all the other trades that have to deal with electro-mechanical systems especially the ones that get exposed to water and salt.
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