It seems the only ball I can find recently that used a high rg high diff core and a stronger cover is the Motiv Primal Rage.
I've looked at the Track 400A and Tour X that use the DNA core and the Hammer Spike's that use the BW Nasty core, but im looking for something that has a cover not so push happy like on those balls
Just out of curiosity, why a strong cover with a highish RG?
Higher RG balls are going to
tend to be "push Happy".
Most polished balls with medium-high RG cores (~2.55) do tend to have fairly aggressive coverstocks once some surface is added to them (2000-3000 grit).
RG Hysteria - RG: 2.58, Diff: .049
Also even if the differential is only moderate, say in the .040 - 0.45 range, adding a P3 or P4 weight hole drastically increase the overall and the intermediate differential.