The Rocket for me rolled way better than any Hyroad I drilled, even though they are the "same cover". The HyRoad was always a little over under for me (15lbs).
The Rocket I use the most has about the same layout as my Danger. The Danger picks up the roll earlier for me, while the Rocket responds a little stronger to friction. With my softer speed, my Danger is a slight step up from my Rocket, even though the cover isn't as strong. Not knowing your game, but from what I have seen on the lanes, if you are some what speed dominate, the cover/core combination can even itself out, and be closer to the Rocket. But with a softer speed or rev dominate, they seem to gap more. Justmy 0.02.