I'm guessing but if you raise the pump up in the sump you will have a lower water column in the pump. This "may" reduce the water discharge from the skimmer.
Like I said, I'm only guessing and am not familiar with your equiptment.
46 gal FOWLR
11lb Live Rock - 40lb Live Sand
ProClear Pro 75 - LR rubble & skimmer in sump
AC 300 HOB
AC 402 Powerhead - AC 301 Powerhead