The fact that you are drawing entirely from the skimmer is probably the reason there is too much suction on the cleaner. Try adjusting the valve such that some of the draw is from the main drain instead of all from the skimmer. The cleaner will pass over the main drain occasionally and if the suction from the cleaner is too high it can get caught up. The slight increase in main drain suction should not affect the cleaner that much since it is usually distributed over a larger area.
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