Not maximum and not stable speed in guided mode

Hello. I have a copter for my hobby and want to use it in guided mode at a full speed. My quad is 7 inch flying in AltHold mode with 60m/s speed. Yesterday i want to test it in guided mode and maximum speed which i reach was 42 m/s. Also at 42 m/s my copter motors worked not stable, i hear it. I cannot understand what is bad in guided mode.
Params which i change for maximum speed:
ANGLE_MAX = 8000
WPNAV_SPEED = 7000
WPNAV_JERK = 10

Can anyone give me feedback about my problem?
Log file: