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TTM-
No you've spare capacity. Why work on it? Spend time where it's needed.
You need to work on longer duration aerobic power to improve that.
Vo2 will improve as you push up ftp. It's not mutually exclusive. You need to get used to doing longer effort. You can do them, just not used to it.I never do vo2 work any more. Still cracked out 430w for 5 before xmas. The other work I do works on vo2 indirectly.
Do intervals from 10 minutes to 60 minutes at 91 to 105% of your FTP
Also, do plenty of Sweetspot(88-93% of FTP) from 20- 120 minutes.
skinny
No solid efforts to build stamina.