20 minute test on 22 Jan - 266W FTP
Ramp test on 26 Jan - 286W FTP
Average the two = 276W is what Im going with for high volume build. I recommend this (doing both tests and taking the average) as it has been accurate for me through a year of training.
Some subjective notes:
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This 276W estimate is 3-5W higher than what I started with for high volume sweet spot base in the gran fondo plan. It makes sense more than the outliers from both tests.
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I finished a gran fondo high volume plan in december '20 and went from initially 220W - 289W at the end on a ramp test. Estimated actual FTP at 280W at that peak (3% off from inflated ramp test). I took a 1.5 week break and started the high volume base at 270W.
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I have high VO2max and anaerobic capability from 4 years of heavy squatting and HIIT at a local crossfit.
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For the same reason I have comparitively (to the awesome athletes here and in cycling, running, plus other endurance sports) poor slow twitch, diesel long term engine performance. This is why I suck at the 20 minute test and take the average of the two.
Hope that helps anyone who is in the same boat.