i'm continuing my progression of increased interval duration at 120%, this week did Tues and Thurs of Dade -1 on TrainerRoad, which consists of 9x2min at 120%. Nailed it. Next week going to 2.5min duration. I may have recouped some of my lost FTP after my vacation week in Feb so maybe I'm not really going that deep, but the real test will be once I go to 2.5-3mins before I can really conclude that my current 275w is too low.