It would be fascinating to see the lid cam of your mate. Seeing the 2 vids was very inspirational for where I have been having challenges.
You look like a very stable platform, your head is staying pretty still, you are hitting inside out which gives good control and seems to stem from a dominant top hand.
You mate seems to move his head a lot, is hitting outside in and hence getting lift on the all and missing straight ones.
I wish I was that tall, but I also think he should hold the bat far nearer the top of the handle. That would make the best use of his long levers! And might help his dominant bottom hand
I'm doing what your mate is and seeing the 2 vids just proved it too me.... I have to find a net, the machine and a camera!
Reading my post back it's more a critique on what I now know I'm doing so I hope you don't mind.
A real coach will be along soon to offer some meaningful feedback
Really appreciate you sharing