I'm still running my RBZ Pros with Step steel, bought a pair of Pro Tacks at Habs sale in the fall, but find they are too stiff, my son & my nephew both tried them too & said the same thing.
I just bought a pair of Ribcor 78K's yesterday, hoping they're just what I'm looking for (previously had Vapors which always felt too tall/restrictive, and before those old Graf 705's).