Doug, I don't think you are super far off. I now know that my car is 2050lbs with me in it, I have 4.88 gears. So you have 350lbs more and less gear than I have. Here are 3 runs from last weekend in less than great air.
1.377 1.367 1.403 1.381
3.974 3.952 3.981 3.966
6.215 6.188 6.201 6.200
108.52 107.62 109.44 107.95
Curtis