Did TM change the adapter on the M5/6? I would have been good to see a comparison with the same shaft and same loft. I bought a used M2 head two years ago after a bud bought one and had a great increase in driver performance. Mine works for me as well. I got several adapters off of ebay and enjoy tinkering with different shafts. I also got a weight kit for it on ebay.
Also, why does he pronounce a word spelled "b-a-l-l" as "boool?" 😁