Mike:

I'll have to dig a bit further beyond the spreadsheets, calculator, and w&b
insert that we have for this airplane (logs, etc.).

I have found two CAP C182Q aircraft on the web that weigh in at 1831 lbs.
and 1848 lbs. respectivly with 88 gal. useable fuel. Loaded with 430 lbs for
pilot and copilot they are within limits according to the documentation for
those airplanes.

It could be, as suggested in other posts, that the empty aircraft moment/arm
is off.

Regards,
Kirk