Just a quick observation, 14.7K and 15K over a 10 lap course with everything else even and you should see some seperation. Maybe the other planes engines were running just slightly faster? Then there is the possibility that the other airframes had a little less drag. Maybe Jr just flew a little longer in each turn. Basically what I'm getting at is that when everything is even, there are a lot of things that can seperate one or many from the pack. Usually the best equalizer is pratice. Best thing to keep in mind is to have fun. Best of luck.
Jimmy Skids