Hi all,
A bit late, but following up on the topic: after failing Hakusan, I prepped for this type of workout (mixed intervals) properly, meaning a few days of rest, food, sleep. This led me to completing Thunder Hawk, although with easier rests than intended. On the following week, I absolutely nailed Bear Head, so at the end, in my case, it was really about getting used to the type of work and respecting the workout in terms of off the bike preparation.