Originally Posted by
shovelhd
Fit is part of it, but so is adaptation. Don't give up on your fit too soon.
This.
If I've been off the TT bike for a few months, it takes several weeks to get back to normal power in my TT position (which is still 15-20 watts less than my road bike). Leading into important races I like to be on it at least twice a week, if not three times.