Did you figure out which rear gear was best?
What I do is correct my runs to sea level using the current density altitude at the track that day.
There is an online link that will look it up for you here:
https://airdensityonline.com/us-track-list/
Once you know your DA plug it in here with your timeslip data:
http://www.dragtimes.com/da-density-...calculator.php
Then you can compare car performance with various modifications directly.