I am actually in the middle of doing the same thing as you are. I just recently bought two 14lb balls. I have a Rogue Cell and a Virtual Gravity. And, I have a Virtual Energy on order.
I agree with you about the VG. It is a very strong ball. You need a lot of head oil to get good use out of the VG, and I have yet to meet a pair of lanes that can really hold up to it.
However, I can say that the Rogue Cell has helped me more on a variety of conditions than any other ball that I have in my arsenal. The cover/core combination is just right. When the VG was hooking too much or too little, the Rogue Cell would play the same lines and get right to the pocket. The hybrid cover allows you to forget about the heads and concentrate more on your breakpoint. I would suggest that you consider adding one to your new arsenal. Especially if you are not particularly tied to just Storm.
I am passing on the Hyroad because I want to try the new Virtual Energy. As for the Energy, I am hoping that the ball will provide me the length that the VG does not, yet provide the same strong backend. The Energy has a hybrid cover as well, but it will be more pearlized than solid, unlike the Rogue. From the early reports, it looks to be just as strong as the HyRoads, too.
As for drier lanes, I will be taking a hard look at the new Storm Fast. For me, The Natural didn't make my short list because of the cover. It is a urethane ball and I personally do not care to go back to that era of bowling. "Been there, done that" comes to mind.
I believe the oils and lane conditions of today are much more "slick" than back when urethane balls were heavily used. The Natural will provide a much less aggressive move to the pocket no matter how strong you get the ball drilled. For me, it would just become my spare ball.
However, if your rev rate is consistently around 530 like you stated, then you should have no problem with getting a good reaction from the Natural. The ball should fit in your arsenal just fine.
Your arsenal looks good, but I certainly would consider adding a ball like the Rogue Cell to it instead of going with two HyRoads. As you know, sometimes it's not about how the ball is drilled, but how well you match up to the lanes with the right cover or surface that counts the most.
Good luck!