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Excellent project!I've worked on a similar project, which is levitating magnet. That also use PID control method. The difference is I use MOSFET instead of H-bridge driver. When I use oscilloscope to measure the output signal of the H-bridge and the MOSFET, I see that the MOSFET will react better with high frequency signal. How about giving a try on any kind of DPAK package?
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What type of stepper do you use? Mine is 57 NEMA, strong enough to get feedrate over 400mm/s.
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I made it. Your tutorial is better than this site:https://brainy-bits.com/tutorials/speed-sensor-with-arduino/