1.8 60ft on radials is something to aim for to begin with, hardly any street cars can do it without 4wd or an engine in the bum. Helps keep the V8s honest for the first 100m at least, they find it very annoying!
Reaction times, it sounds like you're waiting for the green to come up, then going "What? Oh! Hey, we're off!". That's not a criticism, just an observation.
Next time on the line, try timing the lights down the tree in your head, then launching on the last yellow, eg light, light, launch. My little boys are forever saying "1...2...GO!".
That should knock a second off your reaction time to make people pay attention.