I throw medium revs and medium speed. Definitely a tweener... I'm much more comfortable playing the outside line than the inside.
My T-Road Pearl is by far my favorite ball. I love how I put it down anywhere between the 8-12 board and it always seems to find it's way to the pocket, even on a variety of lane conditions. I've found it to be more versatile for me than my Gravity Shift.
I rarely see heavy or even fresh oil, so I don't think a Virtual Gravity or Dimension is in order. I've been frustrated when the Gravity Shift slides through the oil or the carry-down. I know there are adjustments to be made in those situations, but equipment changes are one adjustment I like to make!
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Complete ball arsenal:
Storm Gravity Shift
Storm T-Road Pearl
900 Global Break Pearl
Lane #1 Bullet
Hammer Cherry Vibe
Brunswick BVP Wizard
Columbia 300 White Dot - Blue Pearl