I believe the XLR inputs on the QSC has settings for line level vs mic level. Check that out. With QSC I prefer the XLR inputs
I have a QSC 10.2 I sometimes use for gigs. It blows the doors off any small to medium room.

I don't use BIAB at a Gig. I use 320kbps mp3's I create with BIAB .wav and mix master in my DAW.
THere's a good chance the output from BIAB is clipping audio because output level is too high

I also don't use cables at all from my tracks source to my PA or speaker. Bluetooth works just fine
Many older grayer members on this forum who haven't tried this in a decade will poo poo this.
Check it out ... It works great. Also try some of the Bluetooth foot pedals for controlling tracks playback. Very helpful

I use an XLR bluetooth adapter at the speaker or PA and run bluetooth from my tablet.
I run a cable from the HX Stomp (Guitar Box) to an input or the Mixer.

biab2024(Mac) Latest Build
Mac OS Sequoia 15.0.1
Apple M2 pro 32GB Ram
Logic Pro 11