Lots more to it than just having good intervals... And in my experience, floor toms are way harder to tune. I always find that my 10" is the easiest to tune. People generally tune floor toms first because they have a smaller tuning range, which makes it easier as you work yourself up to the highest tom. This was never the case for me though, since I tune to predetermined notes.What you should do is make sure that your toms are in harmony with each other, so start with the floor tom, which is the easiest to tune, than the 2nd tom etc. Make sure your first tom is perfectly in harmony with the floor tom and than you can't go wrong really.