Well, regarding the bubbles in your tank, I think you are just going to have to tinker with it. I have skimmer that bubbles after I clean it and I just start adjusting one thing, and let it sit for a few hours, then just adjust the air or water a little bit until I get it right.
BUT, with hang on skimmers, you may never get it totally bubble free, my hang on would still lob out a few big ones from time to time, all I cared about was the micro bubbles though.