VAL number looks good. I'd be concerned about the pin length. 5.5 is pretty weak, small flaring. Because the ball has so much length, could be why it's hitting flat and uncontrollable in the back end. Mine was very similar out of box, my layout was 50x4x40. But this ball hooks. I bet you on some fried lanes when you gotta move in, that Primal is probably money.
I'd try adding a weight hole. Start with a p3, that should up the diff and increase the flare. Can even go p4 if you really want to add some kick.
Your cruel is probably "hard hitting" because it is flaring much more than your primal. Even those the Cruel is an asym, these balls are fairly similar.
Just my two cents, I'm sure someone else will chime in as well.