I think it's easier to get a good stereo image with cardioids when recording on stage. Often the best place to put the mics is not dead center. Like when we were taping the Charlie Hunter Trio on stage, we set up way right of center and oriented the mics DIN.
The stage was set-up:
Drums - Charlie - Horn player
...with the onstage stand and microphones about two feet up off the floor and situated between Charlie and the horn player.
Pete oriented the DIN configuration straight ahead, so the left mic was pointed more at Charlie's amp than the drummer. Doing this we were able to get the ambient sound of the horn (not reinforced by the PA) with plenty of Charlie's amp in the mix. With the drummer off to the left and being the loudest instrument on stage, this set-up worked well and sounded pretty good. The only thing I would do differently would be to run X/Y, because I thought the soundstage was spread a little too wide.