the reason it is over flowing is because your changing the level of water in the skimmer and the sump. for best results you should keep your skimmer in a constant depth of water. if i read what you wrote correctly basically you gotta think of atmospheric pressure it wants to equalize the level of both areas of water so by having your skimmer to deep will cause the water level in the skimmer to rise. dont know if that makes sence to you but i would recomend finding a way to maintain a more constan water level in your sump wether you need to baffel off a section so the height remains constant or dial your auto top off to keep the water more constant hight.
Richard
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