This isn't about your amp. It's about the band playing too loudly for the space. Nobody should be drowning anybody else out. Your request to turn down was getting at the right solution, and their response was not good news.
However, you're getting paid and nobody is complaining about your volume or tone in the regular setup you're using (except you), so the best option might be to suck it up if you can.
However, you're getting paid and nobody is complaining about your volume or tone in the regular setup you're using (except you), so the best option might be to suck it up if you can.