Lighting at the shows affects consistency massively. If you're regularly shooting at smaller gigs with poor or just okay lighting, the chances of a decent shot are so much slimmer. I shot for many years, worked for a couple of magazines and agencies, but still could not get a half decent shot in the bloody second room of the O2 Academy in Birmingham! (The magazine editors know the venues with the rubbish lighting too!)
You look like you've got a knack for catching those real personality-driven moments: the weird little things that a musician does that stand out, and they're what make for the best concert photos in my opinion. If possible, I'd suggest getting a wider-angled lens too, to open up your options. It's helpful if a singer decides to jump in the crowd right next to you, or if you want to get a whole stage shot for a bit of atmosphere. You come out of the gig with a bit more variety - especially useful for bands that don't move around a lot, when by the third song you need to try something slightly different!