Your skim will definite be different then mine. Your tank brand new as well as skimmer being new. It takes week or 2 to fully break in. I also have 8 fish in a 90 gallon with 55 sump. Been running for 6 years. So can't really compare skimmate. But trust me it is a good purchase. I started off with a seaclone 150. Only have had reef octopus for about 3 months.
My water level now is right where it starts to turn brown. About 1 inch above minimum water level. Although it usually is about 1 inch above that. I had to Lower it due to major cleaning and skimmer went crazy. So my usually water level is 2 inches about minimum water level give or take a little.