In the DJI Go app's camera view, bring up the main menu (hit the top bar somewhere), go to the gimbal section (little gimbal icon on the lower left), and choose 'advanced settings'
There's a "Gimbal Pitch smooth" slider there you can adjust, that will accelerate/decelerate the gimbal pitch at varying rates...
Think that's what you'r looking for. There's also EXP (exponential rate) control for the response of the wheel that'll help you do some manually, too