5 semitones or a fourth interval between drums helps give them their own voice.
Try tom 1 batter head D resonant G
tom 2 batter head A resonant D
Floor tom batter head E resonant A
This gives some sort of ballpark to where you can tune as others have suggested by listening.
You can then alter top head pitches higher, lower or same as the resonant head, which is adjusted to control the amount of sustain required to suit your ears, and as suggested the environment.
Turning just one lug up or down after the drum heads are even will bend the pitch a bit and can be effective to produce a different sound.
Remember to listen to your drums from out front to see what they sound like from there - somehow.
Often tuning in different venues pre -gig can be a judgmental one, you should consider hopefully the room will full up with people and that is going to affect the out front sound (un miked).
Not too critical though, iv'e never ever had anyone say i had a bad drum sound, and generally leave them as tuned from gig to gig (lazy bugger), they probally wouldn't know anyway, only a drummer would. Long as they are tuned evenly with good heads and bearing edges, each drums within it's tuning range and the drums are tuneful and complimentary to each other, i get by without too much fiddling.
Question two. Probally only one that knows would have been his drum tech
, you can always ask him
http://www.ginger-baker.com/