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I'd often start with "last year's" FTP and struggle so I'd just tune the workout down a few percent until I could nail it but I guess that's a bit more difficult with VO2s although they're still long enough you could start and (assuming you have mouse/kb handy) drop them down when you start to tie up.
Is the limiter your legs or CV at the moment do you think?
Have you tried caffeine or a pre-workout 30min before session?
Have you got motivating music on?
Are there any distractions stopping you from getting focused on the intervals?
Hmm, all the drills from 90-105% I'm fine with and if I knock them back to 115% I seem to be OK, so it's just that last 5% that's an issue.