I did Ebbetts today too on Tacx neo in erg mode and also experienced it hard to Average the desired Watts in 5 sec. I was able to hit the wattage just not “average” it in such a short span of time. I’m always in the small ring on the front and middle of the cassette. I feel like I got the benefit of the workout even though the numbers don’t look perfect. My workout is below:
https://www.trainerroad.com/career/danasummey/rides/49024411-ebbetts