best mid-lane ball in my opinion is the hy-road just dont drill it too aggressive.
the Freeze is another great chocie... plus its cheap.
btw its tough to get a pearl ball to roll even, they are made pearl to go down the lane, if your looking to have a ball roll mid-lane you have to play around with some things... a good way to achieve this is buy shining up a matted ball thats not too aggressive like a hammer acid. or you could drill a entry level ball aggressive like a ebonite boom.
also as a company Brunswick tends to create there equipment to rolls sooner than the others... if you can find any older BVP line balls they would be good as well
