Hello, I have a Macbook Pro 15' here and I came from a 13inch Macbook Air (2009 mind you). I find it very hard to control. If I have the slider on 3 bars for the trackpad speed setting, its just a little to fast and I always when moving the curso to click something miss it by a tad, so I practically make two clicks at everything. If I move it down one, its just to slow to use on a 15inch screen. I am install in my 30 day window, should I go back to 13 inchs, or would a replacement be needed? Any recommendations? Thanks!