I have had my 1st race with my new FX 12 T-03 S, as well, and what I had planned to write was almost exactly what gonzoY5 has posted. 'Cept I ran mine on the bench for 4 tanks, and then put it on the track and started leaning it a little, keeping it rich and the revs down.
1st heat, went great till the 2nd gear stripped. 2nd heat, same story, and I shortened the shift point so it'd go to 2nd sooner. Sucker's getting stronger each run, but I'm kept the temps at 218, and didn't hurry leaning it any further. I had put 15x48 1st gear, and 20x42 2nd, so it wouldn't rev to high. About 5 mins into the A main, the thing just "woke up", where it had been revving to, say 25,000, and it started revving to say, 35-40,000. I was running with Uriah Murnan, he had one of his Murnan Modified engines, and I could close on him down the straight.
This was the most $ I've spent on a 12, and it's the best $ I've spent this year!

Result ?.... 1st place A main.