The 255/ 60 ET's you're using are taller than the stock gums. you could have gone to 275-50-15's to retain the stock 26.1" and give you more contact patch at the same time. Probably worth another .10 or so short times. Yes would love to see you try the V-box again with hot gums! keep up the good work! BTW i took my T to work today. God i love these cars!
Taller tires will take a harder hit to the advantage of just having wider rubber. Plus the taller tires are better for mph on the big end. If you really want it all, go to a 28" 275/60/15. He wasn't spinning the skinny tires he had so going wider wouldn't improve his 60'. This is my experience anyway. I think he needs a better tune to get the power to come up faster.
