Mike, As far as I know, Lancair has always recommended the proper tire
pressure for the various airplanes in the manuals.

I have ALMOST always used the tire pressures recommended in the manual
(circa 1987) for my 235. Early on, when I thought the nose wheel looked
really underinflated (25 PSI), and I began to see a lot of wear on the
shoulders of the tire, I decided to try a more reasonable (I thought) 35
PSI. On the first landing at that pressure, the shimmy was almost
destructive. Returning the pressure for the nose wheel to that recommended
cured the problem.

Perhaps the pressures recommended in the manuals for the different aircraft
may have some meaning.

Dan Schaefer