I am getting a big headache over my sump. So I have everything set up for my sump, but it's not as easy as I thought it would be. The pump is rated at 850 gph, I have 1 1/4 inch PVC DIY Overflow, everything is working fine EXCEPT: if I were to let the pump run full blast it will suck most of the water from the last compartment, and may run dry. If I were to restrict the pump, the sump seems to build up a lot of water and may overflow. I have been trying to find that perfect equilibrium, but for some reason, I cannot. How do you guys do it?