Question about exhaust ?

I am currently running JBA long tube headers, secondary set of cats, stock y pipe and a flowmaster muffler but im tired of the drone that I get with my current set up. I don't mind the exhaust being loud but I do hate the drone that I get between 1500rpms -2000rpms.

I was thinking about getting straight b pipes and getting a different muffler (better quality than flowmaster) but i do need some advice from you guys!

Thank You!