Need Help - FTP Regression: what do I change?

I agree with you that the Ramp Test might overestimate my real FTP.

It’s just that I did all those tests in the same conditions: TrainerRoad app, same bike, same trainer, same everything except temperature (I didn’t record it). So, if it overestimated in January, it’s still overestimating it this week. I am more concerned with the downward trend than the actual absolute number.

I did adjust the setting to 265 a few days after the test because the workouts were too hard (except for Sweet Spot and Threshold).

It’s possible that I went through a vicious circle:

  1. Ramp Test FTP too high at first
  2. Fitness deteriorates during training cycle
  3. Ramp Test FTP lower (but still too high compared to actual FTP)
  4. Then repeat 2/3… burying myself.

It seems like the mid-volume plans offer more variety as well.
As suggested by @kitenski: