"Of course, i'm usually surrounded when i do this (that's just how good i am)"
I've heard the greatest busker alive today (you know who) say the line "If you don't want to see how it's done, stand over here [he points]. If you want to see how it's done, then stand behind me- with your heads up your @_ _ es!... c'mon, move it, make room,..." etc.
That's just how good he is.
IllusiveCoinMan,
The solution is simple. Select routines that work for the angles you HAVE. No one wants to see a magician turning right left and backwards so that they can do a coin effect. The magic should look clean and fair, and for that to happen- your torso should be relatively head-on.
Coin magic DOES tend to be kind of one on one, but even for groups. When I work a group larger than three or four, I'll single someone out, stand next to them, and basically just perform for them, with everyone watching. You have to watch the angles for the room you're in, but the single spectator's reactions will spur on the reactions of everyone else. (Make sure everyone can see the magic, though).
Basically, if you can't do backclips because everyone is seated- don't. Just work from Downs, Finger, or Classic Palms.
Scott.