One of our fiddlers uses a Fishman bridge pickup.
It's handy. No feedback problems. There are several
options for bridge pickups:https://www.google.com/search?q=bridge+ ... 28&bih=966
Our other fiddler doesn't want anything like that since
he needs to also play in an orchestra. So he uses a
small clip-on mic that sits over an F hole. He feeds
back if he gets too close to the monitors.
But that's still better than using a cardioid mic like the
c2000. If you want to stick with a mic on a stand, you
might start with something more uni-directional so it
picks up the fiddle and cuts out surrounding noise like
what's coming out of the speakers. 'Fraid I don't have
an example handy, though.