It's a SWC 160. And his sump is designed just like my old one. 8" baffles, so that isnt the issue. I think you are simply either running it way too wet, or too dry. Also, it's time to pull it offline, and take it completely apart and clean it real well. One thing you need to check on is the threading coming from the pump to the bubble diffuser plate needs to be teflon taped real well. I found that once mine wore down a bit that I would have big bubbles breaking up the smaller ones, and causing some pressure and turbulence, and then it would overflow suddenly. Also be sure to take the air tube off and clean it with hot water and your dial to tune the air has a very small screw on top of it, you need to remove that screw and pull the top off and make sure dust hasnt clogged up in there too. A good cleaning will go a long way with this particular skimmer.