I am controlling a very tight window in a 8 foot sump. My low level to keep from cavitating the pump is 44” and my high level is 55”. The problem is inrush of waste water has a surge periodically. I was hoping to get some feedback on possible solutions in reference to rapid response out of the drive. I am using v/hz control and I other than the pidl loop I am attempting to control with decel and accel times. I have about an 8” window for level control before I over flow or cavitate with a unstable water in rush.