those chassis books are great, but the info they give on settings is kind of generic, gets you in the ball park as they say, but you still need to play around with the settigs to see what the car likes the best.
plot out all the holes and possibilites for the 4 link, then you have some reference points.
try a lower and longer setting, ie drop the front of the lower bars down 1 hole and see it the car likes it. you may need to play with the shock settings to see if there is more improvement or non at all. Write everything down in a log book, you can never have too much information.
a test and tune day at the track is ideal for this kind of stuff as you do not want to do this on a regular race day.
you only need to do 60's or 330's for this, no sense wearing out the motor.