Looks like one or more of the drum cleaning units is vibrating causing your pitch lines. Have the tech swap drum units around and run single color...
What controller are you running? If you are using Fiery, PLEASE make sure your operators are leaving the DPI setting on 600dpi. Do not change it...
I have 15 plus years working on Canon and Ricoh. Let me shed some light on your color issues with Ricoh. In my years of working for the former...