Newschool:
I have a RS250, and had the same concerns (having to close the riser almost completely to get skimmate to flow over). I thought: less water is draining, so that must mean less water is being skimmed.
I called ER, who said the opening/closing is used just to control the static water level within the skimmer body. They said it does not affect the amount of water being skimmed. They said the pump is still pulling in the same amount of water, and that is what's being skimmed.
After washing my skimmer, I, too, have less skimmate flowing over into the cup. It takes a day or two before it starts picking up.
Which pump are you running? The Gen-X it comes with?
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