If your running race gas, then you should run a race chip, that 93 chip only has 23° of timing in it, with the stock turbo in 3rd gear, you should be to at least 25°... Usually 28° does the trick.
Since your running race gas, get the car to the point were there is no pump gas in it, and run at least 21psi, get a race chip and id bet you gain 6-8 mph in the 1/8th with the converter locked in second at the track.
BW