Notably missing from your list are the hardest threshold workouts like Mary Austin and Leconte. How are you doing on these? Can you complete them at your 285 FTP with zero backpedaling?
Also, workouts like Spanish Needle are aerobic rides disguised as anaerobic. How are you completing these? Any backpedaling, pauses in the workout, etc? Fast twitch guys find the first half of 15s microbursts to be downright easy. It’s the second half that gets you, especially in the later sets.
Also, how quickly are you reaching max power on these sprint bursts? It it nearly instantaneous or is ramping up over the 10+ seconds?
Lastly, having a discrepancy in energy systems shouldn’t be alarming. Reading your complete post, the thing that stands out most to me is the stagnant FTP.