I'm having almost the exact some problem with my Vertex 200. It's been running now for almost 3 months. It's at 9 1/2" just like they recommend. I haven't added any chemicals or anything except for some vinegar dosing which I stopped a month ago. I still don't have it functioning right, the bubbles are usually more like when you add Alka-Seltzer/Eno vs what should be the nice slow big bubbling. I try not to adjust it much anymore, it's fine one time (rarely) then the next check it's overflowing like yours. If I used the drain adapter on my tank it would be fresh water in the matter of days. My old little Euro- reef skimmer would kick this things ass, but I paid so much dam money for this thing so just has to work right lol ? 
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Mike
150g reef, 55g sump, T5's, Vertech 200A, Profilux III - German made is highly over rated, should just say Gerpan made.
Reefkeeper - individual obsessed with placing disturbing amounts of electricity and seawater in close proximity for the purpose of maintaining live coral reef organisms.
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