I had similar problems with my Katz Eye on a k20d.
I emailed them and Rachel replied:
"The manual focus calibration is corrected by changing shims, as you have
already found. The shims come in a variety of thicknesses and are available
directly from your local Pentax dealer. The part numbers are as follows:
76830.M02200A - 0.15mm
76830.M02200B - 0.20mm
76830.M02200C - 0.25mm
76830.M02200D - 0.30mm
76830.M02200E - 0.35mm
76830.M02200F - 0.40mm
The 0.25mm and 0.30mm are the ones most commonly supplied with the camera.
A front focus condition will require a thinner shim, as you have observed in
your test without any shim at all. The parts are very inexpensive (less
than $1 each), so it is probably best to just order one of each... or at
least the ones from 0.15mm to 0.30mm. "
Now these part numbers are for a k20d. I don't know if they will fit a K7. My manual focus tests did indeed confirm that my Katz Eye was a small amount off. After calibrating my autofocus lenses, I found the focus point in the viewfinder was slightly off. Replacing my factory 0.30mm shim with a 0.20mm shim resulted in the auto focus point matching the manual focus perfectly. This was critical for my manual focus lenses....
Check with
customerservice@katzeyeoptics.com... Rachel may be able to help you with the K7 part numbers...
Hope this helps,
Dick