I'm not necessarily questioning you or your results and I also won't claim to be any sort of drag expert (I've only attempted 0 to 60 runs 4 or 5 times - not really my thing and my clutch loves me for it

), here are a couple of my results (I've never even looked at the data close enough to consider how/where to improve):
Keep in mind that I have an 'S' and these runs were done with 2 people in the car (each weighing about 175 - 180) and 3/4 of a tank of gas. The weight was determined from a DOT approved scale and RPM calibration was also done.
That said, 5.9 is impressive. My website has MT magazine recording their best time as 6.0.
The one question I have is about your weight. I have the base weight of the 2.5L being 2822 lbs. You have your calibrated weight as 2950. Do you only weigh 128 lbs? Just curious. If not you may need to adjust that a bit - don't know how that will impact your times.
Have fun!