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Though I agree with you, I wasn't totally ruined at the end, so j could go harder. First five mins I was holding around 285w, then after that I went up a gear and held 320-350w quite well.
Re-test next week.
Bainbridge-
Difficult to know.
I'd add 10w to the starting power (295w) then see how much I can ramp. When you're close to your max 10 can make a massive difference over time.
My FTp is 280w. The other week I held 105% for 24 minutes. Which wasnt even during a hard test. This hints that I hould e able to hold more for 20 mins and thus set a Bigger FTP. But adding 5 or 10 watts to my 20 min climb power destroys me.
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Are you doing a blow-out effort beforehand? Anaerobic work capacity can contribute to an artificially high FTP when only doing 20min tests.
Smallfurry
hippy
Not used Training Peaks, but sounds like the power calculation was made from the non-zero average, ie discounting the period of time when off the bike as opposed to TrainerRoad that included the zeros.
The only real way to know which figure is correct is to run the test again!
As for starting too conservatory, that's the best way to do the test IMHO.