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Agreed, but not necessarily at this point in the season. My A race is IM Wales in September and I plan to race 2HIMs, at least one 100mile TT and other TTs, and train on the TT bike over the summer to adapt, but for now it's mainly about having a bit of relaxed fun on the winter bike (with half a nod to the London Mara in April).
Still, I did a 20min CP test on Friday and it was way down on what I'd have expected from a race. I'm pretty sure I'm a bit weaker than I was at my best during the Summer but I'm sure not that much weaker :-)
In terms of differences of FTP calculation (20min CP test), I presume it is also common to have a lower estimated FTP when calculated 'on my own' vs in a race? The main difference I can think of is that I usually ride my road bike in my own tests, but then ride the TT bike in races. Still, I think a large amount of the difference is psychological.