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1" pipe to the sump, two 90 degree bends
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There is the reason right there.
I was running 1.5" all the way to the sump. no 90 degree bends. one 45 and that was it.
In effect you are running a 1" drain. I had a 1.25 restriction(didn't need it) but the entire plumb was 1.5".
hth