Gday Ian
As you have a 497, the results will be certainly be better than an ASII,
however, i still wouldnt trust the numbers.
I have done many tests and the results are nowhere near consistent.
If you do a polar 2 star, it creates a transformation matrix to allow for polar misalignment, but it only uses this for "gotos", not for tracking.
For best operation of a 497 Austostar ( for tracking, image rotation )
you should do a reasonably good drift align
then do a Polar One star.
Andrew