I decided to get a simplicity skimmer a while ago. At first, I was a little skeptical cause they are very cheap. After break ln period, I can honestly say it's working as good as my old hydor external skimmer. Great value for the money imo.
You're going to have to adjust air intake and water level to get it to a 'sweet spot'. Also, if the skimmer is doing it's job, it's very possible that the water is much cleaner than when you first put it in, causing less muck in the water.. Causing less foam.
As for the micro bubbles, that's just something you're going to have to figure out. My sump is large enough that the bubbles go away by the time the enter my display. I had an older system where I had a similar issue, I used a baffle to reduce water flow before it entered my return chamber, eliminating all the bubbles.
The bubbles will significantly get better after break in period though