@ aris opus
No, I really did mean turn down the master.
Dunno why you think it won't help if the tracks levels ain't balanced. That's precisely why I do it. Sometimes, at normal volumes, you can't quite pin down what's wrong, but then when you turn it down really low, you can hear a certain sound is overpowering the rest.
Little tip for FL users:
Put your mastering chain on channel 1 instead of the master channel, then everything that was routed to the master, route to channel 1.
Now, with channel 1 routed to the master, you can fill the master with analyzers, volume plugin, and low pass filters, for comparing your bass to reference tracks.
Doing this also means you can route your reference tracks to the master, without them going through your mastering chain, so you can compare easily in your analyzer chain.