Recording a show that is not too loud with CA-14's > CA-9200 > M10, you should be fine with the CA-9200 set to +30 (with volume control to the max).
Unity gain is supposed to be somewhere in the 3 to 4 range on the M10, so in the future, I would recommend keeping the M10 set at 3.5 instead of 2.5. It's best not to set a recorder much below unity gain because it requires more gain from the pre and, at a very loud show, could cause the pre to clip even with the meters staying below 0 dB. I doubt if that would be especially likely to happen with a setting as close to unity as 2.5, but it's always best to take all available precautions.