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dbr-
Maybe its fast twitch vs slow twitch fibre composition?
My legs are a bit odd, short, very fast twitchy and I struggle with medium to long sweetspot/FTP intervals due to leg pain rather than CV. My legs feel better climbing out the saddle at slower cadence (maybe slower lactate generation), recently did Ventoux on Zwift completely out the saddle at 50-60rpm.Fast twitch afaik generates much more waste products, so if your legs are very aerobically efficient, your legs might just run out of oxygen rather than boiling in lactate.
Can you do a 3m max effort, and then settle into sweetspot and keep going as your HR recovers? (other than any pursuiter's coughing fits etc). If I do, I genuinely can't move my legs properly for at least 5 minutes.
Acliff
How do your legs feel at the end of say, a 1-1.5 minute 200% FTP effort (maybe 550-600w)?
In my case, my lungs are on fire, my legs feel like they are wooden logs that are on fire, and further pedalling feels like I am trying to pedal through leg cramps.
If I get off the bike, I have to hobble around, until the aching dies down.
Perhaps I am CV system limited for example I know that at the moment, my leg endurance/repeatability/HR recovery is rubbish, though I can put out ok power at anaerobic and vo2.