Yeah, that's at the very top of the USCF racing ladder as it is, even up there with the pros who make a living riding bikes.

Cadence is only partly about speed & efficiency. Muscle-fatigue and recovery is the other factor. Typically the higher cadences will spare your legs to allow longer endurance and faster recovery day-after-day. When I'm doing my long weeks of 500-miles+, I make a concerted effort to aways use low gears and spin. On short weeks with sprints & intervals, yah, I'll push a big gear at high-speed. But I definitely need more rest days and time off.

Picking cadence comes down to a matter of balancing your muscles with your heart/lungs.