Excited to upgrade firmware today- great improvements in ext IMU tab from b2 which I was using. I've got an rctimer 32 bit rev 3 board from Nov 17 and a 3 axis legacy gimbal.
From a stable setup on b2 however, on b8 I've now got pwm noise no matter what setting I use, even silent. This is only on the roll axis. Additionally the previous pids were unstable and I ran autotune- getting similar figures. The axis makes a lot of pwm noise and high frequency vibrations, if I move it off centre by hand it falls in that direction to the limit of its physical travel and never recovers. Luckily I backed up the eeprom.