I did some research on making weight with the shadow here is the search is used: http://www.google.com/search?q=making+idpa+weight+with+Cz+sp01&ie=UTF-8&oe=UTF-8&hl=en&client=safari
It looks like you will need to change out your guide rod to the stock plastic one, use 10 round mags, and possibly change out the mag break to an aluminum version used in a CZ 75. That should get you pretty much there, if not you may have to try the
factory plastic grips or the .40 oz wood grips sold online.