An update. I remade the durso and lowered it a couple more inches. It didn't make much of a difference in flow rate unfortunately as the water still raised right up to the very top of the tank.
ChrisRD - where would be a good place to look for a needle valve? Hardware in the brass plumbing section?
Herbert - I was really trying to keep any other pumps out of the main tank and just run with the single mag 7, however that is definitely another option. I installed a ball valve after the pump yesterday before I made this post so that I could throttle back the flow, however I really really have to throttle back the flow in order for the overflow to keep up with the line.
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