Airman 'Dave' it is hard to know where to start addressing your incoherent aerodynamic babble.
'V speeds higher with altitude' ? 'flying at MMO to stay out of coffin corner'
'A 767 flying like a beached whale'
I have flown the 767 for 10 years and can state categorically it is one of the most responsive transport jets flying.
As to your other aeronautical 'theories' I suggest a little more research or stay with MS
