lowering 60 foot time

ok....looking at the timeslip page, i see that there are some people running low 12s with a slower 60' than me.....
guess that just means they're making more topend HP than i am, or not getting a good launch.

i just figured the S/S springs would be an easy 1/10 or 2 off my 60' and ET

i will get some squirters and run it up til i get black smoke on take-off and back off a size or two. then i can play with jetting, after an initial plug reading.

should i adjust for secondary opening before or after i get the jetting right?