That's a pretty bowlin ball. It looks a lot like this Roto Grip ball my buddy had. As for your backend dilemma, I would try it at 4000 abralon. Maybe 2000 polished, or even 4000 polished. And if that doesn't work, maybe drill your fingers deeper to help create flare. Maybe an X-hole too. Increasing flare SHOULD have it pick up earlier. I know on my T-Road it helped tame the over/under a ton.