Welcome aboard!
I was sitting in the same seat as you just a few short years ago. I figured my Ping clones were the same as every other set out there, I just needed to figure them out.
Not so.
I finally decided to pick up a set of Big Bertha Irons as a present to myself for an achievement I had made in my life. I went to the shop, grabbed the 7 iron and went to town.
Now, my best expression for the feeling I had with these new found stick of glory was "like hitting an orange". The ball felt so soft off the face and the sense of feel was incredible. I knew a push with my eyes closed.
There really is a difference in the types of metal and the research that goes into OEM clubs over clones. Many component groups offer great clubs as well that have just as much, if not more than average, research and development going into not only th heads, but the shafts as well.
Be aware that a shaft has as much to do with feel and response, as well as results, when dealing with OEM and component clubs. I would be willing to bet that you are using an iron that isn't set up to your swing. Most people that haven't been checked are.
Give yourself the benefit of the doubt and go and try out a few sets. Try a game improvement set from each one of the Big Guys (Taylor Made, Nike, Callaway, Titliest, Cobra, ect) as well as a "better player set". Sometimes a club that works for one doesn't work for another. Take me for example, I can't stand Titleist clubs. They make fantastic stuff, i just can't stand over the club for some reason. To each their own.
Nothing against your current setup, but I think it's always in the best interest of someone that is going to dedicate some time to the game to check out what is available to make their games more fun as well as using your talent to your potential.
Life's too short for poor clubs!
Again, great question and have fun at Shot Talk!
R35