I ended up calling Pentax Support/Sales in the US directly and getting the metal shims. I ordered the whole range of sizes A-F and used size D. I believe that my camera was shipped with size C. So now I have 2 of these sizes.
After more than a year of not trusting the view through the eyepiece, I'm slowly getting used to knowing that what I see is correct. The paper shims worked OK for a wile, but they did have humidity changes and they were noticeably different from one side of the frame to another.
For what it's worth, I called Katz Eyes and talked with them for a bit. Regarding the dust bunnies, she suggested a few techniques to clearing the dust which have worked well for me, including using a nylon brush to lift the particles with static cling and using gentle humid air to help "unstick" a dust mote.
Last edited by smigol; 04-08-2009 at 12:37 PM.