Darker, rich tone

Ever since I switched to bass clarinet (last year) I always notice that my tone was slightly off. I feel like I sound somewhat bright and buzzy, and I’m not sure how to fix that.

Moreover, my peers around me have a dark,resonate, bass clarinet tone, so I always wondered what is the case?

My set up is low C Delmar privilege with C star mouthpiece, with Vandoreon 3 reeds. I use a the “standard” silver ligature. However, I believe it is a “me” issue as my peers still have a dark tone even with their crappy instruments.

Does anyone have any tips? I also sometimes play flat on my notes too.