I just did this. I ran m-drol 10 mg 4 times/week for the first 2.5 weeks of my h-drol cycle (50/75/75/100/100/125/125). Results were nothing special. Back pumps blew, just like when I ran m-drol solo at 20 mg/day. Did not have other usual sides, though. I took 10g of taurine/day along with potassium, calcium, and magnesium but back pumps persisted. It impaired my squat and deadlift workouts enough that I had to stop after 2.5 weeks, I had originally planned to pulse the m-drol for as long as possible. I'm currently up 10 -13 lbs without really increasing my calories much, if any.
Bottom line, it seemed like a good idea but I still got back pumps back enough that I had to stop. Strength increases (my main goal) seemed to be slightly more than if I was running h-drol solo over such a short duration, but not by a whole lot.