I used to run an HOB
skimmer by Reef Octopus and even after 10 months of use it would skim wet. I went with reef octopus because it got great reviews.
I finally decided to get rid of it and went with sea side aquatics skimmer. Much better design and it uses a sicce syncra pump which is dead silent.
So I say if you can't reach an optimum performance, get a new skimmer and sell yours on eBay or Craigslist like I did. Better cut your losses now and enjoy this hobby to the fullest.