Yep, the monitors can be a problem. Your musicians have to communicate to you the levels they need but you should also make a trip to the stage to verify they aren't too loud (or not loud enough).
With that kind of set-up you should have a good balance that doesn't need to run at concert levels.
Do experiment w/different settings, eq, effects & so on. Mic positioning from the monitors, monitors from the edge of the stage & so on.
You might want to check out some basic pro audio mixing books. They get you pointed in the right direction, like what freqs to start off with, gain structure & so on.
With that kind of set-up you should have a good balance that doesn't need to run at concert levels.
Do experiment w/different settings, eq, effects & so on. Mic positioning from the monitors, monitors from the edge of the stage & so on.
You might want to check out some basic pro audio mixing books. They get you pointed in the right direction, like what freqs to start off with, gain structure & so on.