Darren;
There is some great information in
this rather lengthy thread which was started several years ago.
The key to a low e.t is generating the quickest short times (60', 330', 660') you can. Lots of people think they can sacrifice a good launch in the hopes of "making up" what they lost on the line on the second half of the track. Unfortunately, it doesn't work that way.
As has already been mentioned, you can "roughly" expect to pick up 1.5X in e.t what you pick up in 60' time; i.e. if you pick up .1 in 60', you can expect roughly .15 at the stripe.
You've already got decent mph for the e.t. you have, so the power is basically there. Now you just have to make the car (and the driver) work as efficiently as possible to use it.
Remember: There's often a lot more e.t. hiding in the car itself than there is under the hood.
Eric