Originally Posted by calamarichris

Thanks for your thoughts. Really, no snideness at all.
Another thing about cycling I love is that it is different things to everyone, and what works great for one, is crap for another.
It was actually the top of my stroke (11-to-2 o'clock) that was weak, not hamstrings. When I started focusing on hip-flexors, aductors and abductors, my flat spot assuaged and I had another FTP breakthrough. True, lessening my weakspot did allow me to pedal more comfortably at higher rpm, but my avg cadence for the test went up only 3 or 4 rpm on the 20 min test.
It was shortly before learning this from Nate Loyal, that I'd experimented with the flywheel.
I absolutely concur that my ~200 pounds @ 20mph is a colossal amount of inertia, but after looking at 1.5 years of workout data, my avg cadence has remained roughly the same, but my avg & lap wattages have gone up while avg HR has gone down. (At least this was the trend before meeting my gf in May and my training going into the toilet.)
What works for me might not work for everyone, but I'm convinced that flywheels cause stagnation in the minor muscle groups, and we're better off without them. The fact that I was able to get the stupid thing in nearly new condition for $30 delivered (and the freight was more than $10), suggests to me that someone else drew a similar conclusion.
Thanks again. Peace & safe riding.