Not sure. Do you see any anomalies in your test like I did? Remember it takes 75% of the best 1 minute power.
Another thing that I experienced was that for the test I would put on loud music and watch a POV bike race on YouTube. It’s both a distraction to the pain and motivation to PUSH. The problem is that if you don’t do those things during your hard workouts it can be mentally tough to demand the same performance from yourself. So I’ve started doing this for hard intervals now and really think it helps me get through them. The TR crit videos work or I recommend the World Cup XC races on RedBull TV.
These are just a couple of examples of things that have happened to me that caused me to struggle to adopt a newer/higher FTP. Even if you can’t pinpoint something that’s causing your workouts to be overly hard, it doesn’t mean that there isn’t something making them overly hard. Think it through. What’s different?
Coach Chad said in a recent podcast that people get faster all the time without excessive suffering (the episode on DOMS I think). From that perspective, I’m certain you will still get gains even if you reduce it a few percent for a while. As motivating as a higher FTP number is, remember that it’s a journey.