I have a Hayward Navigator Pro but am having a heck of time getting it work reliably. If I move the valve to provide more suction on the vacuum line then the pump suffers. If I turn up the Intelliflo pump speed up to compensate then its not running efficiently. Just when I think I have it figured out I'll check out back and just see that vaccumm sitting there ! Any suggestions/ideas on how to find the best balance between pump speed, valve adjustment and vacuum run time. Pool is around 25K gallons ...