The only other thing that bothers me about your durso Mike is the big valve you have at the top. When I built Adams ( oxymoron ) durso all it took was a very small hole drilled into the cap to get it perfect. I cant remember what size it was but it was super small, I started with a 1/16" drill bit and worked my way up until it was bang on.
What size pipe did you use for the durso? if you cant get it balanced I will send you a new Tee, elbow and cap. All you would have to do is drill the hole. I will see if I can get Adam to take a couple pics of his durso from the side.
As for the syphon break, it is really strange that what you did there isnt working. A check valve would solve the problem but I am a little stumped.
Do worry about having all the water that passed through for sump going threw the skimmer. Most if not all systems are the same, not every drop of water goes threw the skimmer before it hits the DT again.
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