A couple more thoughts... Is it very hot or humid where you are? That does effect tuning in some cases. Also, while doing the break in, do it on a smooth paved surface. The extra drag created by a loose surface or grass will make the break in process more difficult as well as raise your engine...
All of the above are excellent points and I agree with them. I just want to make sure that you understand, the break in process is not optional. You NEED to do This. This is before you run a tank thru just playing or whatever... The break in is the VERY FIRST thing you do. It insures longevity...