Automatic or Manual transmission?
How was your traction?
I am working on the same goals, though my car is a fairly different beast. To that end I'll make a few suggestions on how to run faster, but not on how to improve power as I am not familiar enough with the modern engines to really be a good source of information.
Some of the things that help and are free are lowering the air pressure in your tires to get a better launch.
Remove any excess weight-leave the spare tire and jack and all junk out of the car.
Unhook the front sway bar, again this helps with the launch and is something that can be done at the track and then rehooked up for the ride home.
Inexpensive improvements include relocating the battery to the trunk, (use a sealed box and do it right if you do it!) upgrading tires to drag radials, installing subframe connectors and traction bars if needed.
There are certain safety things you should do if you are going to run a car on a drag strip. Have a fire extinguisher mounted within reach at a minimum-a fire suppression system would be better.''
Install a driveshaft safety loop. A broken U joint can result in a driveshaft catapulting the rear of the car, or it can come through the floor.
and practice-learning to make a proper 1/4 mile run isn't just get in the car and do it. With practice and familiarity with the car, learning the best shift points etc. a good driver can shave a lot of time off a run. Don't be afraid to find a really good driver at the track on a test and tune day and pick his brain and see if he might take your car down the track for a run. You might very well see him rip a time off a 1/2 second faster than you.