I have the RSK 600 skimmer and I never manage to collect proper skim mate. My N03 is running at approx 11 so that should allow me to pick some some nice dark skim but for nothing.. Skimmer has been at me for almost 2 years so well dialed but nothing. I have a mate who has the deltec and its no comparison.. am I doing something wrong? Pic is to show how wet skim still doesnt pick up anything