After almost 3 years of TR and numerous ramp tests with too high FTP estimates, I can confidently say you are far better off training with a FTP that is a little too low than an FTP that is even 1% too high. Error on the side of caution as the latter will end badly for your training and motivation.
After about 2 years of ramp tests I’ve learned I need to stop prematurely and NOT go to failure as instructed, which is about 15-30 seconds before ultimate failure. I’ve learned through trail and error to notice/feel this inflection point, which has resulted in an accurate FTP for me that allows me to complete challenging but doable workouts.
Clearly the ramp test is not giving you and accurate FTP. So chose another method to determine your FTP.