Not sure if the mm can do 6 poler's, I don't remember seeing anyone using that. Some people get cogging with neu's on the mm, but not because it's 4 pole.
Did you have any cogging with the align esc, before you killed it? I didn't notice any during the few minutes I watched you driving. Are you going to try another one of those esc's? Because it was doing well for a $100 esc, for a while anyway.
You've killed 2 esc's in 1 week running that motor on 6s, and now you what to try 7s

Did that 5s setup you tried have decent top end? They seemed to have a lot of torque, but not as much top end as I was expecting, since the kv is the same as my neu.
Are you going to try and get the align esc warrantied?