I think that even minor changes in the head pressure of your skimmer pump will affect the performance. I highly recommend a constant level first stage in the sump. So many people complain about having to constantly tweak their skimmers, and I think this helps a lot for any in-sump skimmer as most of us have fluctuating sump levels.
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90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
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