Spin vs Rotation for new bowler?

I recently picked up a 15 lb rhino and starting bowling more. I'm a strong guy, over 200 lbs and can throw around some big weights. I haven't been able to get the rotation/hook that I expected with a "performance ball" even if it's entry level. I can get more hook on a house ball. I think the combination of both the fingertip grip and the heavier weight are throwing me off for now.

I've watched all the videos I can find how how to get my rotation going but I just can't seem to get it right. I get maybe 6 inches to 1 foot or hook and haven't really been getting that explosive release that I'd expect.

Maybe I'm expecting too much out of this ball? What is spin vs rotation and how do I emphasize rotation?