Sometimes it takes a little practice when you've made changes. Last week I was running 2.2 60' times all night with a best of 2.199, Keep in mind I've got 17" 235/45's and eibach sportlines and Tokico shocks (al the wrong parts for the drags), while this friday I couldn't best a 2.4! (the only time I did, I missed second
) I gained 3.5mph through tuning though, I am going to practice some more because I know that I'm capable of doing better, right now I'm embarassed that I have a car that does 104mph but can't get out of the 14's (14.071 to be exact).
Keep practicing but if I could afford it, I'd just get a sticky set of tires because they'll always be faster.