First thing I'd try with your set-up is a sound hole cover - you may find that it changes the tone and sustain, though. There are vented covers. The notch filter on your LR Baggs should be adjusted to see if/where that helps.
If you have the QSC or the bass amp directly behind you, you can also try to adjust your position relative to those.
Start with your volume low to see what level the feedback starts. Increase gradually. Same with the bass players volume.
Have you tried muting the A string momentarily when you first hear the feedback?
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