Yes, you are changing the oil too often. I had well over 15,000 miles on one oil change and sent in a sample. They came back with the results and said to run it longer which was nice to hear, but I usually change mine when it's convenient someplace over 10,000 miles.
I'm running the T6 in a 2005 Ford F250 with a 6.0 diesel.
After having said that you're changing the oil too often, do whatever makes you happy. I had a 1975 Trans Am with a rebuilt engine that I ran hard. Always tried to change the oil every 1,000 miles, but that was before I knew about synthetic oil.
Bill