Hey Greyedout,
I had 2.6 MM's DH front and rear. Great choice!!!
In my opinion the Butchers are ok, but the DH versions of the MMs are something else!
Upsides:
They are mega grippy and are sure to help you regain your confidence.
They are also almost indestructable, you can run them with low pressures as they have super thick sidewalls. (Check out the screenshot below). The yellow bit in the screenshot is some sort of hard material that you cannot physically bend, unlike the paper thin Butcher. Point and shoot at any rock garden. They are that good!
You will see on the sidewalls recommended pressures start from 17psi up to 35 psi.
I ran mine with 18psi front and rear and they were great. You may need more depending on how you like things set up.
Downsides:
They are heavy 1.4kgs.
Who cares!!! you have an ebike and to be honest I did not feel I was having to push any harder to get up to speed or to get up steep hills or my battery ran flat any earlier 
They wear quicker than normal.
Hey! you want grip? Well there is a cost to grip. If you are riding on terrain like I have in Brechfa Wales which has a lot of routes made of slatey/rocky compound then 6 months tops before you have to think about changing them. As you know, most ebikers are covering twice to 3 times the mileage they used to do on their non engined mtb's so 6 months is a lot of miles.
Hope the above helps.
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