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kbarch, your experience is not the same as mine. I'm not trying to challenge you or tell you that you are wrong, just noting that I have a very different experience.
What gearing do you run and are you using resistance rollers?
My bike is 48-16 (79 inches) on Sportcrafter rollers with the "High Inertia" non-resistance drum. Tires are at 120 PSI. I can let the cadence drop well below 50 and spinning back up to over 110 is not nearly the struggle you describe. Everything spins up very freely.
Last night I did 1.5 hours, 28.3 miles at 18.8 MPH average. Max speed was over 25 MPH and I rode for about 30 seconds at 35 RPM (yeah, sketchy) during cooldown just for fun. My point is that varying cadence was not a huge struggle.
Again, not trying to challenge but wondering what the difference is. You are a pretty strong rider IIRC. Maybe you have a much higher gear ratio?
-Tim-