Gabe, why not use your main PA[JBL's], slightly behind you, so you can hear what the room hears..I have done this for 25 years..I prefer hearing what the audience hears..In my band we use the PA out front as you do, and use monitors..It is much harder to know what the room hears that way..

One other observation, you mentioned you have your speakers 30 feet apart..that is far if you are running stereo, My guess is you are not,,Are you in mono? Unless you are talking about a large room [300 people]..

For small and medium size rooms, I now have a Traynor K4 stereo amp that stays behind me..I can hear great as well as knowing what the audience is hearing..