First think I want to say is nice consistancy. second I ran 16.8 my first zetec time out with lots of wheel spin and hop so you can do better. The only thing that i had that you didnt was flexback, and i drive a manual. The next time i went out i ran 16.62 with the same mods 4 less psi in the front and left the line a little easier, and Im prety sure that next time out im going to hit 16.5s no problem. So I would say practice. Try,
32psi in the front, max in the back
remove speaker equitment and spare/jack(Should help with your top speed a little/ acceleration too. 100lbs=.10sec.)
pre stage with the e brake up and your foot on the gas till she trys to pull foward
dont just floor it when you drop the brake try close to 3/4 till your hooked and moving then full(That should get that 60'er down a little bit)
Try those things with and whatever else you feel you should. Every car is a little different so tweak how ever thats just where i would start. In my opnion i think that you will be posting a faster time with in a week.
I predict 17.3s in your near future at least.