thats even worse, multi band compression and distortion on the master, especially if you don`t really know what you are doing with the multiband (which most people don`t, if you are not careful it can really change the groove, as well as other things).

You`re being lazy, go back to the mix and apply distortion with post distortion EQ on the tracks you want distorted. Then you could apply compression to the whole mix to bring it all together a bit.

It`s the long way, but you`ll learn a hell of a lot more about controlling distortion with EQ, your mix will end up tighter, clearer and more punchy, and things can still be done at the mastering stage.

The reason it all ties together at the mo is basically the compression effect that the distortion is having, as it pulls everything together. This can be done, much more controllably with, well, compression.