When you're having your revs measured by whatever means, does it matter what ball you use? All things being equal (speed, weight, release, etc.), does the core or cover affect the actual number of revs you put on a ball? For example, when I throw my Rush (symmetrical core, solid reactive), it seems to rev more than my X-Factor (assymetrical, pearl). This is just my perception of how they look like their revving as I've never had mine measured. If this is the case, will people use fast revving balls to have the measurements made just to "bump up" their rev numbers?