From the looks of it you have a really high 60 ft time which seems to be killing you. A high 60 ft time usually just means you gotta work on your launch. You have to do a couple runs before you really start getting the feel for it. Try a certain rpm and if you spin too much try it a little lower. If you bog at the beginning try it a little higher. If you can get that 60 ft time down I can easily see you in the mid 15's no prob. When you were on the track did you lower your tire pressure in your front wheels? Also just for the sake of winning those racing you wanna get yer R/T down too. The trick is to always jump the gun because it takes a while for your brain to register green then act upon it. So the light right before the green you wanna drop the clutch and thats how you get those .500 perfect R/T's.