13.3 seemed to be all about managing your rest appropriately in the 150 wall balls. The two most successful examples I heard all day were two people who did 5 rep sets! That's a lot of sets. A common one that came up also was the 10 reps - 10 seconds of rest. That is pretty much 15 rounds of tabata, not easy. Here's Kelly using a popular strategy to take away that initial medball clean, that you get no credit for.
I do believe everyone has a sweet spot interval in them. A number they can sustain across all 150 reps with the same amount of rest between each set. This is all hypothetical of course, there are too many variables to control for to ensure you'd be spot on. But the chance you get lucky, find that sweet spot, and get off the 150 wall balls like holy shite I'm ready! It's worth a shot, in theory. Workout:
13.3 - AMRAP in 12 minutes: 150 Wall Ball (20#/14#) 90 Double Unders 30 Muscle Ups