You should run some hot water through the venturi ever couple of months to dissolve any buildup in your venturi.
Why do you need to control the amount of water going into the skimmer? Is the skimmer drain fed or fed from the return pump? I thought one of the GenX pumps fed the skimmer?
If possible, see if he can custom one for you where the skimmer is drain fed with the 2 GenX pumps as recirc.
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32"x32"x20" Cube-ish tank
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