i too found that my water level would very about a 1/2 inch .
This is why i increased the height untill just a trickle was going down the emergency drain . no is stays exactly there for weeks now .
the emergency drain is still perfect .. If you think about it . You are restricting your main drain .. mine is restricted about 1/2. So if the emergency drain is wide open and only taking a trickle down it then it can easily handle the flow of your main drain .
Eaither way you need to do a test by completly blocking your main drain .. shut the valve .. and see how the e drain handles ..
I orginally had the e drain set to high , and water was getting to close the the edge of the tank before properly flowing down the e drain..
good luck
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