My Two Cents...

Let the musicians set up like they normally would in a performance (semi-circle, whatever...) then mic them from there.

I don't know much about the KSM44, but if it can do a figure 8, you may consider the classic M-S approach, using a 4033 as the front cardiod and the 44 as the M-S feed...

If that doesn't work well, then try the 2 4033s in an ORTF or XY...

Of course, depending on what the recording will be used for, a single omni (will the 44 do that?) placed in the center of the trio just might do the trick...most string groups mix themselves very well....

I'm with midland on the two AT4033:s in ORTF setup.
I find ORTF very good at giving a listening spectrum equivalent to your ears'.
I think recommended setup for ORTF is about 17-20cm apart (at the capsules) and angled apart at aprox 110 degrees.
Find a place where you and your ears like the listening spot, and place the mics at the same place. With a little luck the recorded result should give you the same listening as when you listened live.

thanks a lot, Ill try with both 4033´s and see how it goes.