If you have the first gen Tamron, make sure it has the firmware update that fixes Autofocus. I use that lens often shooting shows and get great stuff. The way more expensive Sony GM is better at handling stage lights, but the Tamron is plenty sharp.

As far as banding, make sure you aren’t in silent mode and electronic shutter, use mechanical.

My go to exposure settings are pretty close to yours, but I use 1/250th, and that makes a difference. A static singer-songwriter, I may go much lower. A very energetic performer, I may bump higher. I just let auto-ISO do its thing these days. I’ve had amazing shots at crazy high ISO, and Lightroom’s Denoise AI cleans then up well.

I generally use AF-C, low, with subject tracking.

I never use Auto in Lightroom. I tweak all the sliders to taste by hand. I‘ll use Auto White Balance as a starting place, but that’s it.

Outside that sort of technical stuff, mostly the difference between good and great is going to come from capturing the right moment, the framing, etc. that is more about the photographer than anything else.