The only problem is I keep getting distortion through both the PSR2000 (my mic goes through the keyboard)and the mains.

Hi Angelo, In my opinion---distortion normally means, your giving me too much.
On my Digitec, I have a control for input and another for out put. I adjust the mic going into the Digitec first. This is first stage fo correcting distortion. Then I adjust the out put of the Digitec to the keyboard as the last step to prevent disatortion. Hope this helps, John C.