Hello. Very thanks Mikrotik!!!
This problem is for me FIXED!
My affected devices: Samsung galaxy Xcover4, Lenovo K6 and tablet Lenovo YOGA2. With 6.41.3 is maximum TX rate 54Mbit and download speed max 20Mbit.
With 6.43rc are ALL devices Tx Rate 72.2Mbps-20MHz (maximum supported).
On samsung Xcover4 is download over 42Mbit
