A good way to simplify the two workouts a day for the same body part is:
AM: 80-90% of your 1RM, longer rest periods. Explosive reps. NOTE: this workout IS NOT aimed at muscular failure. Its primary goal is speed, explosiveness, and strength development. As well as CNS recruitment. Once the rep speed start to slow down, you stop the set. NO forced reps here.
PM(4-5hrs later): 40-60% of your 1RM hypertrophy based workout with MAX 60seconds rest between sets(usually 40seconds). (This would be the IDEAL time to implement your MI40 workouts!) Supersets, NOS sets, Giant sets etc..
The goal here is to exhaust the muscle and fatigue as many muscle fibres as you can. This is a good time to incorporate more single joint isolation exercises as well. (flyes, machines, cables etc).
Strength is not a concern, as you have already trained the fast twitch fibres and trained for strength.
The second workout of the day is going to now force the nervous system to recruit many more dormant muscle fibres. Most of which you may otherwise not be recruiting during typical workouts.Think of workout one as a massive pre-exhaust/fire up/warm up.