tuning a T775 controller ?

so how are guys setting up the throttling range, intergal and derivative for different applications, example of 2 apps. are a cooling tower fan vfd and 100% oa ahu with chilled water/hw valve, i typically set the thottling range between 10-20* on all applications, on tower speed control i'll set my intergal time to around 300 sec. now on oa unit due to how fast the variables change i'll set the intergal to 0 sec. as well as the derivative. im noticing when im going back to some buildings after the season has changed the mod. outputs is hunting and not as smooth as when they were 1st setup