It’s worth mentioning the importance of training periodization here as well.
Rest and Recovery are absolutely critical to sustainably getting faster and not burning out. This is why, when following our plans, you’ll have a set number of weeks with some hard workouts followed by a week of recovery.
@hoge, after looking at your career, I’m seeing 19 weeks of hard work starting early in the year without a true recovery week and the only few days off being due to illness. This is essentially non-functional overreaching, which isn’t sustainable for anyone and is sure to lead to burnout. It looks like you tackled a ton of hard workouts and set all kinds of new personal records during this time, which is probably why your FTP jumped up so quickly for a short while around this time.
It looks like you took a considerable amount of time off and are now just getting back into training, which is great and I’m happy to see you using Plan Builder to set you up with a solid training schedule as well as to prepare you for your events next year! Following this plan closely and dedicating the prescribed recovery weeks to be exclusive to recovery should make for a much more sustainable plan.
Remember, stimulus + recovery = adaptations!
If you’re interested in reading a bit more about training periodization and supercompensation check out the links below!
- Training Periodization: Macro, Meso, & Microcycles of Training
- The Science of Supercompensation and How It Makes You Fast
@gcarver I wonder if this was partly because there was almost a six-month gap between your last FTP detection and the Ramp Test you totally destroyed in July. 
Either way, it looks like your detections have been pretty accurate since! 