@PhishPhan22 --- thanks for all of your info above about your set up and requirements. As we've communicated several times over the past few months via email about your set-up and needs, I'm pretty confident that when you are discussing your clarity concerns, it may have more to do with various instruments and perhaps your effects grouping, etc.
As I know you just received your second BA15-3SLT from our dealer, I'm confident there is no issue with the cab or array specifically, but as @Loring mentions, you may just want to use a music source and listen to some Full Range music so you can compare the 2 cabs individually --- sitting next to each other.
If you run a signal into the INPUT of your amp from a phone or other music source you should easily be able to hear the mids and highs coming from the Array's.
Set the MG-800 EQ FLAT, with the BLUE CONTOUR at noon position. Play music through cab 1 by itself and then right next to it, cab 2. They should sound the same.
I think the simple "listening test" would be sufficient so you are assured both cabs sound the same. BTW --- the Ba15-3SLT would make an awesome PA cab, for sure.
If you'd like to get back to me via email again I'm happy to go over this with you.
I hope this is helpful.