I’ve never done that, if you do this too often this would be another indicator that something isn’t right.
No, I wouldn’t say that. It can be an indicator based on other factors in the workout. If you feel like all your interval days (hard days) are smashing you, you have to turn down intensity and cadence drops , then probably. If that is consistent after a new FTP then you’re probably over reaching.
TrainerRoad workouts are designed and tailored to your FTP so you can complete them. You’re supposed to succeed without altering the workouts. Sure, some days you’re off, or the workout is your weakness, but by far the workouts should be doable. Some will be tough, challenge you and push you to your limits. But in the end, your plan should feel like a challenge not a beat down. TrainerRoad is far more enjoyable when your FTP is correct and you’re not holding on to a higher number.