Try riding at sweetspot (rather than ftp) and with bigger gaps between sprints?
Also those sprints aren't really going to be max-beans (or you'd only manage one) so regulate the effort of those to stay consistent.
[ not an expert opinion - just what I'd try ]
I'm guessing what he's talking about is an 'attack' so.. say (if your ftp was around 260w ish), a 5-600w effort, rather than a 1400w one.
@dan started
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Try riding at sweetspot (rather than ftp) and with bigger gaps between sprints?
Also those sprints aren't really going to be max-beans (or you'd only manage one) so regulate the effort of those to stay consistent.
[ not an expert opinion - just what I'd try ]