I am so impressed with you gigging drummers and how you know how to tune your drums to sound good on a particular riser and or room, very impressed!
Jeff, in my case it's just been a matter of walking around the kit and tweaking until each drum "opens up" and becomes bouncy, as opposed to sounding like a cardboard box - sometimes it's a matter of detuning a single lug to get the bounce, strange but works.
I'll typically stand in front of the kit to tune the rack tom, since the audience is out front. Also sometimes reach over the kick and use a stick on the pedal to hear the drum from that angle. The weird thing about the rack tom is you can get it sounding great from the front, but from the throne, with the same tuning, it's choked. Oh well, audience wins.
Years ago my dad mentioned a type of wood that if you made a ping-pong table out of it, the ball wouldn't bounce! In fact I think a friend of his did just that and they all had a good laugh. Anyway I think some drum risers are made with this wood lol.
...all of which is a tick off topic I realize, with apologies to Purdie Shuffle. It must have been very rewarding to have the precision tool justify your ears :)
Mitch