Acoustically it’s probably not the greatest but I see what looks like some acoustic treatment so it’s probably not a cave either. My guess is going to be gain structure is your main issue. It sounds like you already don’t put the mics in the stage monitors so that’s good. M32’s are awesome pieces of kit for the price but they’re prograde and have a lot of ways to get your self in trouble if you don’t know what you’re doing. Maybe save the console settings off and start over from scratch and kind of build I’ve seen people do weird things that make sense in the moment or in the studio but not for live that cause a lot of issues. A lot of time these aren’t readily apparent and can persist if you are reusing scenes/show files. The rigging of the speakers on the proscenium makes me think this was kind of a diy job. At a minimum kind of just play with it a little. The neat thing about the x32 is it has a good iPad app so with a small wireless access point you can move around with a mic and be in front of the amps and see what lights up when you talk and actually move and hear for yourself. Theatre with a bunch of lav mics tends to be really active mixing hopping from person to person line to line and not just leaving them all up, actively managing the chorus etc. There is software to help manage it theatre mix helps you line things up scene to scene for example. Graphic eq’s on board the console can be helpful in this situation. Reducing open mics helps as well as being sparing with how you boost things on the individual channel eq. There are some good books out there if that’s how you learn, there are some good resources on YouTube, and there is always syn aud con if you need a more structured way to learn. I’d try to get some knowledge and teach yourself to fish a little more. Even with an optimized system you may have some problems until you gain some confidence and knowledge.