It looks a touch rich, but if you are happy with how it runs, I wouldn't change anything. Also, 30 seconds isn't really long enough to get a good reading, and the engine should be run at it's normal load, ie, flying. You also need to do what is called a "clean cut", which is running it at full throttle as long as is practical, and then immediately kill the engine without letting it idle at all.

All in all, plug reading is a difficult and somewhat unreliable method of tuning model airplane engines. This is further complicated by todays crappy gas, which gives varying and difficult to determine plug readings.

So, with all this in mind, "If it works, don't "fix" it".

AV8TOR