Do you have G6 ballast (6 pumps)? Have you adjusted your ballast fill and drain times? On my Max with the WM kit (no additional midship overflow added yet) it takes approximately 12.5 minutes to drain the rear and midship bags. They both drain completely without having to cycle. Filling in the other hand requires me to fill, ever ballast levels and then refill which I contribute to trapped air because I don’t have an overflow on the midship bags yet.