Brian:
Thanks so much for writing in with your nice story and your questions about strength. At the point you have reached in terms of max strength, 60% of BW, I think you’d find good gains by moving to more power type training like hill sprints. The transfer over to your running performance will be better with hill sprints because the mechanics and rate of contraction are the same as running. Make the transition more gradual and go 2-3 weeks with 1 max and 1 hill sprint each week if you see gains that way then you might shift to 2x HS/week. My normal prescription is to keep 1x/wk HS when I move to the ME block.
I hope this helps.
Scott