The Blue Hammer remake is not your answer. I have that ball as slightly weaker, but similar in reaction to the Roto Grenade, at the same surface. You can, however polish the New Blue Hammer and it won't lose backend reaction like the Grenade.
I think you are on the right track with the Supernatural, you might also want to try the Avalanche Urethane. Surprisingly, I had that as stronger than all the urethanes you mentioned, at the same surface, and it comes polished.
Hope this helps