I'd say the 330' and 1/8 is more important than the 1/4. The 1/4 only givers you the time elapsed and the speed over the line, it doesn't tell you where you picked up the time.
I'd go 60', 330'and 660', most of your accelleration rate is going to be over that distance and where you're more likely to be affected by other factors i.e. wheel spin, keeping the car straight, suspension issues etc; thats where most drag races are won IMHO, not at the finish line. Any increase in that part of the track is going to be multiplied at the 1/4 anyway.
If your 1/4 times drop and there is no difference in the 60, 330 or 660 then you know you're picking up speed in the final 1/8 (unlikley unless you have big turbos kicking in) the car is usually settled by the 660 mark so you'll gain more information from monitoring the early stage than the latter
Your timing ticket will give you this data
