I've read conflicting reports on the the cross hatching vs the way you did it.
It seems to be the consensus on the vw forums to NOT do the cross hatching. Lots of people drive their cars hard, but very few competitively autocross or HPDE it.
From my talks with recent SCCA members, and veteran auto crossers, they subscribe to the cross hatch pattern. They claim it gives the pad a more "virgin" surface to start with, yielding in a better initial bite.
Your wife probably falls into the first category, so I think you'll be fine.