Every X2 ive seen that was drilled Pin up was a over under nightmare, so i went pin down with my 1st one, with the cg kicked 45 degrees and a 3/4" hole on my val about an 1 1/2" below my pap. The ball set up nicely in the mids and had a hard continous arc on the back. Another thing i realized is the X2 is not a hook monster, but on true medium conditions that ball is a BEAST. Sounds like you matched up the bowler with the wrong ball for the conditions he is seeing.
--------------------
Taking your lunch money, one strike at a time....