Does this model had the black dots on the Venturi? If so it should be screwed in all the way then one complete turn out the factory calibrates the pump to this setting for best performance. If the skimmer just started to work normal I wouldn't touch it let it work for a few weeks and see I usually have the outlet open almost full on my skimmer. Should be a line on the standpipe with where the recommend the bubble level be kept at.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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