I am also struggling with cramps likely caused by poor muscle endurance. I would like to increase my endurance so I can be fresher at the end of the race and still be able to do my best 30sec watts.
It is almost funny how similar my experiences are. I also struggle with cramps and need to really focus on my power during racing not to overcook and still being able to “use” my sprint power in the end.
I feel that sustained power is my weak point. When doing hard group ride or 20min intervals, although I find it useful, I am dead for 10 days.
IMO, this is in general the key point in the dilemma of anaerobic oriented atheletes: Those type of workouts that are supposed to be the one that improve sustained power are at the same time the ones that can wear you down quite heavilly. So, for me the problem to solve is: How can fast-twitch dominant athletes improve sustained power without destroying themselves? Low SweetSpot (~85% FTP), no middle zone at all (only Polarized) or only a few threshold sessions sprinkled in?