Have a play with others. SM58 is a higher output than my Sennheiser, for instance. Might be worth a try if you have gain problems.
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I personally like my mic channel to be a little bit louder than the music and so when I had a DDJSX briefly I would knock the other channels down a little. It did annoy me that the music levels never reached the 0db mark though. I got a mini mixer recently and whilst it's not needed I found it's a lot nicer to have a full EQ for your mic and a master EQ for your music and there is so much more headroom.
I am using it with a S5 though which is tiny compared to the DDJSX