Have you cleaned the bubble box pads? When that plugs up, it slows the outflow, which forces the water higher in the skimmer. If your water level where the pump is stays consistent, you should have to mess with it much, until the collection cup really starts to get covered with gunk.
I clean my collection cup (all the surfaces) about every other day - it works mucho better when clean.
Also, you might have something blocking the impeller in the pump, which can lead to inconsistent pressure to the housing. I'd take the needle wheel assembly and the impeller out and clean them well.
The SS's have worked great for me (had a 65, now a 125). I get a full cup of thick, extremely smelly gunk every 48 hours.
180G build thread
180G All-glass with dual megaflows in a custom stand
AquaC EV-180 skimmer
250 pounds LR
160 pounds aragonite
Custom acrylic sump from GlassCages.com
2xPCX-40 return pumps
2x250MH 14K, 2x175MH 14K - PFO lighting, 2x65W PC
No-name 36W UV
Water General 125GPH RO/DI