I know this is the Storm forum, but hear a 900 Global guy out.
In my opinion, you should drill a ball for how fast you want the response to be. If you drill a ball that is fast response with a drill that makes it respond fast, use it on the right condition.
For example, you drill a ball that is fast response (Shiny pearl, high diff) with a fast response drill (4.5*30 or something), you're going to need to play the lanes more front to back. Once you try to go more left to right and pitch it into the dirt, it will be over under city. Probably best used on longer patterns when you need a fast change in direction.
That said, I will take balls and go with a larger val angle (lower pin) for control. It reads the midlane for me because it's slower to transition. When I notice the pin down ball getting a little soft downlane, I will switch to something faster to get it to read correctly.