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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 :-)
If you're racing on your TT bike you should be training and testing on it. You'll lose power in the TT position if you're not adapted to it.