New track time....again!

[82 GT]

I did a little bit better tonight. I ran a 12.85@102.58
Two weeks ago my best time was 12.98 at around the same mph. Only thing I did different was bumped the timing up a litttle. I'm not sure exactly where it's at now 'cause I forgot my timing light at home. I just turned the dizzy a little bit more. At first I was running 13.01 and 13.02's until I changed the timing and went the 12.85.
I still don't understand WHY I can run quicker E.T's and STILL run a 102-103mph.
I also had a best 60' time of 1.708
Here is my run:

60'....1.708
330'..5.165
660'..8.102
mph..83.23
990...13.688
mph..102.58
E.T....12.858

I think this is just about dialed in now and I don't look to improve much/any better with this setup.
What do you guys think.....do I have a litttle more in it yet or am I about dialed in for this setup?