Many people have complained that their SlayR is very flippy.I believe they drilled as you are suggesting Andrew.
Seeing, as the cover is WEAK!, I stacked mine with the pin just below and exactly between the finger holes, with the CG stacked immediately below it (pin-CG distance is 2 5/8") Mine goes long on dry to medium-heavy (much more direct line, of course), it never does flip, just sort of nicely turns the corner and is so usable, it's disgusting. I keep trying to use different balls, some slightly stronger, some weaker and I keep scoring worse; this is the ball for me currently. I can swing it or I can go VERY direct (had to recently and scored fairly decently - 695, on what for me has been very difficult lanes this year.)