I am thinking by overspin he means he was at the top end of his throttle range over most of the track?

You don't want to be pinned WOT when getting around the track.

I usually go with a rule of thumb of gearing to top out towards the end of the longest straight. From there, I can adjust my gearing accordingly after reviewing temps. Works well, usually stick with the gearing or go 1 tooth change at most.

Or, if you want just a range, the 16T and above is a nice selection, or 35mph - 40mph for top end speed is what some gear to as well.