Dude! I'd say you're pretty much getting nearly the best of it for that mph! The heat and adjusted altitude is killing it. Did you have fun letting go of the button? How many times did you practice holding it on the chip before you went to the line the first time? Did you get a chance to try a different launch rpm? Staging is super important for lowering 60's. A guy on here running no electronics bumps their cars in with the trans. brake button and they are pretty darn successful at it.