The ball you're looking for, most likely, is the Hyper Cell. Unfortunately, it is discontinued. You probably can find one online or perhaps on Facebook at bowlingballtradingpost. If it does not have to be Storm/Roto, you might consider a Jackel from Motiv or a Bad Intentions drilled strong and taken to 1000 or 500. Look at the RG and Diff #'s and find something similar with an aggressive cover. All of this, of course, is in my humble opinion.