I have always tried tuning to an arpeggio and have had very good success with this type of note separation between the toms.
With my recent *quiet-kit layout, the kick drum likes to live at a certain note. I am tuning around that. So,now instead of my usual arp tuning, I have discovered that I like how pentatonic tuning sounds when I practice.
I have had no luck with any precise tuning. I instead try to find the natural preferred note of each drum and that usually results in pleasant intervals, while making each drum sound at its best. It rarely matches up to any kind of recognizable piano scale.