A good glow engine tends to settle in over time, and yours will likely idle better and run smoother next year than it will this year. You have answered your own question, though, if you're looking for more performance.

If the engine is running "really rich" then it is not anywhere near optimal performance. You need to begin leaning the needle valve at full throttle a bit to increase your power output. You don't want the engine running "really rich", you want to find out where the setting is for peak rpms and then turn it back to rich just a little bit.

As the engine breaks in, you'll actually notice it on the low-end or idle setting. You will have your engine tuned nicely and then go fly it two or three times. After you get some good, solid flights in with the engine tuned in nicely, all of the sudden your engine won't idle properly anymore. It will start to "load up" while it's sitting on the ground idling and you'll have to turn in your idle screw a little more. The plane will once again idle nicely and transition to full throttle smoothly and without hesitation, but your idle speed will actually drop a little bit.

Running your engine slightly rich will protect it from friction and still offer near optimal performance. Running it really rich will provide mediochre performance and will retard the breaking-in process.