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It sounds like you need to increase the size of the hole in the standpipes on the 75. If the hole is to small it can siphon the overflow down and "flush"
What I would so since you have 2 drains in the 75, is plug the hole in one of the durso's and put a valve on that drain line. Use the valve to adjust it to run in a full siphon mode that is just a little bit slower than what is coming into the thank, then the extra water goes over the durso quietly into the sump. You will just have to adjust the valve until 90 + % of the water is going down the one drain.
Kim
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