Meppwc Do your revs increase with the higher speed? If they don't you are going to be pretty speed dominate at 15 mph and 220-250 rpm. The first thing to keep in mind usually a different ball isn't going to fix things like a low rev release. I would suggest trying something that has a little more surface and a lower rg to get the ball started up a little sooner. Rotogrip Disturbed, Brunswick Melee Cross, or similar ball should give you a little more traction in the oil. Just don't expect the ball to fix any problems you may have the Hyroad pearl is a excellent ball.
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