Those numbers do sound about right on the stock tires and stock gears. Looks like the DA was about 750 at your track today according to the online calculator.
If you get a good set of drag radials, you'll knock a good 2-3 tenths off your times and potentially even more with shorter gears too.
On the Bama 93R tune in my 11 GT, I've run 12.175 at 116.51MPH in about 950 DA. That is on 4.10 gears and MT ET Street DR's in my auto.
I like those times you got. I agree that different gears and tires should even get me into possibly the 11's.