I run a Prism Pro, and have done so for about 2 years. I run the water flow adjustment at about 45 degrees. (which would be about 1/2 of maximum flow) Basically, I think that you are just trying to push more water through there than it can take.
My pro came with with a media basket, but it is difficult to use any fine-grained media. I put a media sock OVER the basket and put the media inside. Yes, the basket wants to rise out of the skimmer, but the overflow cup is designed to hold the basket in place.
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