I have owned Ruger Red Labels for many years. They have served me well, and if taken care of properly, they will last a lifetime. You said the Ruger fits you, and shoots well. In sporting clays, these are two of the most important elements to success. The extra weight of the Ruger is actually a benefit because it encourages a smooth swing and a positive follow through. If you are looking for a great gun, it sounds like you already have it.
On the other hand, if you are looking for a second gun for shooting sporting clays, both the Browning and the Beretta O/Us are excellent. There are others that are in that same price range that are also excellent including SKB, Franchi, and others.
One last thought. Don't look for the magic gun that will break all the targets. The one you shoot best will do the job, but it takes practice.