It is a bit high....Ive had my ASM and ER working in 12 inch's of water but even that is high. Looks like you might be drawing to much air. Try pinching the air line a little (or a lot....lol) and see if that helps. Adjusting the riser tube so the water level is about at the top of the skimmer neck may help. Its hard to tell where the water level is in your pics.
Scott
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