Johnny, I've been following this over at the GT forum as well.
I heard that you were first looking to peg 261 on your next attempt. 275 is bound to eventually happen... if top fuel cars can run @ 300 in just 1/4 mile, a 'street' car can surely start coming close to that eventually... right?
http://www.motorworld.net/forum/showthread.php?t=62156