Kansas Kidd

I have had my Stoeger 2000 for about a year now and i have enjoyed the gun and have harvested 2 Turkey's with it, But I have found that it patterns quite low. I have to cover whatever i'm shooting at and the target is still not quite centered in the pattern.To date the shotguns i've owned , I place the target on top of the rib and this results are a nice even pattern with the target centered. Any suggestions?