I can't tell what you skimmer is doing from that picture.
As mentioned, there will be a break in period for the skimmer since you cleaned it. What is in your tank as far as fish go? I'd like establish your load. A skimmer rated for 200-300 gallons is on the large side for a 150G display. Especially if your tank is lightly stocked. In a case of an oversized skimmer in the absence of enough dissolved organics, I'd expect to see bubbles that burst on the surface and not foam. It's the dissolved organics that cause the bubbles to stick together in order to create foam. With enough DOC's, the bubbles can't stick together and instead burst at the surface. A video of your skimmer showing whats going on in the neck would help me help you.