What are you trying to achieve with each ride? And can you post pictures of your power for the 2 different rides? It's hard to assess the effectiveness of anything without knowing both the aims and the steps taken.
I've not used Big Ring VR, so I have no idea what the typical ride is. I no longer have access to the TR catalogue (injured so account is suspended), but I have ridden Palisade a couple of times in the past - when I did it was an hour and a half of over-unders. No hour and a half ride should average anywhere near your FTP (or your FTP is definitely wrong)! Judging by the picture, it's 5 sets of over-unders - 1 minute at 95%, 2 minutes at 105%, repeat, repeat, 6 minutes "rest" at 40%. It's a workout designed to enhance your ability to recover from being above your FTP while still producing almost FTP power. I think it used to be at the end of SSB, but I don't know for sure and it may have moved. I don't think it's one of the harder TR workouts.
If you only did a few weeks of TR, and you started with Sweet Spot Base, then you weren't supposed to be killing yourself - SSB1 starts relatively easy and the cycle has a progression that builds up the intensity to the end of Build and Speciality. The hardest workouts are probably in the second half of Build. Does BigRingVR have training plans or just rides, and do they have any sort of periodization built into it?