I'm no expert at drag racing by any means, but here's a video of my 12.65 run if it's of any help. For launch I was just trying to get revs into the right range (5-6k rpm) and then put the pedal to the floor just before slipping the clutch to try and generate some load. Didn't use the handbrake.
I think my 60ft times land around the 1.7-1.75 mark on the good runs, it's just keeping in your power band with shifts after that.
EDIT: I notice you shift into 5th before the finish line. Not sure if you can do it in a 6spd, but any chance of ringing it out in 4th to save the shift time?