Like others have said I think new tires are going to help your 60ft a lot. Here is a picture of my Dart launching last Saturday. This is with brand new MT ET streets. This run was 12.39 @ 107 with a 1.70 60 ft time. You are making more horsepower than me because of your 109 MPH. Once you get your 60ft dialed in you should see some faster times than this 12.39. Have you checked to make sure you have 5 inches of front end travel?