Thats an awfull small tire....
My opinion, the rest of the car needs to be perfect if you have any kind of horsepower to get your 60fts consistent. I think all it would take is a little bit of a cold track to throw off your game.
I have been using qtp's on my amx for the last 10 years. I feel they require a decent amount of air pressure 14-20lbs and I seem to have better 60fts when theres a good amount of heat in the tire...Not so much that your doing a crowd pleasing smoke show burnout but just a little bit extra.