I have tried a lot of sets violin strings and found the best setup for
my machine:

I'm using Ralph Schultz's bow wheels (broken in).  I use for A and E
strings plain steel guitar strings, .010" and .014".  For D and G strings
I'm using the Helicore by D'Addario;  seems to work the best.  These
strings seem to require less bow pressure and sound better at the lower
notes.

Good quality rosin is important also, along with a good slow to fast bow
speed.

Chris Kalstone