I dont really go stereo live because it only works if the person is standing directly in the middle. Stay you are standing on the left you wont hear the right or get the full effect of the stereo image. Years ago i had that issue when i used to pan the toms and someone came up to me who was standing on one side said " i think the drummers floor tom mic is broke we can really hear it compared to his rack tom" thats because they were standing on the side the rack tom was panned more to. So live id always stay mono, but this is only my opinion. 
I think having a look into the panorama function may help you from what I remember it can move the rigs the stereo field.
From the manual : Panorama This parameter allows to move the signal within the stereo base. The “Panorama” parameter affects HEADPHONE OUTPUT plus all "Master…" Output Sources of MAIN OUT as well as S/PDIF OUT
Same here, I'm 100% mono live for the same reasons, it's hit or miss but mostly miss.
I was looking for the same thing, so now I'm running two kempers to get that sound, it works and I love it
Hint: look into the manuaaaaal.....
[with a rocky voice and lots of verb]
Hint: look into the manuaaaaal.....
[with a rocky voice and lots of verb]
Is that in stereo, mono or panned ?
Anyway, just hit the "RIG" button, make sure you are on page 1 and presto there's the panorama button - works like charm ..
Berry
Great , I won't have to RTFM 
