I noticed too, coming from my 8100/Tmo to 8130. I don't know why it is the way it is, but I've learned to live with it. I hope to maybe get a vz curve (if that ever happens) and hope the trackball has improved by then.
2007-8830-Verizon Global edition (returned in 30 days)
11/8/07-Verizon 8130 Pearl