help with chassis setup on a ford street stock

My husband has a ford Fairmont street stock (all mustang suspension) our class is called southern street stock any cube inch stock suspension on bottom and may have after market uppers in stock location. He is having problems with the car getting forward bite out of the turns. We have changed rear springs, shocks and it's not much better. The track we are running @ has been dry slick and @ times dusty.
The weight rule is 3000 lbs but we have added 200 lbs to get more left rear bite. Most cars are weighing 3200 +. We are the only ford around!


Any help would be appreciated  

i used to run a t-brid same suspension as the fairmont but i ran pavement, i hard to run the car very soft in the rear to get any forward bite at all, i ran 165 lb springs in the rear to get the weight transfer i needed  

thanks!!

he has 300left rear spring and a 250 right spring. soft socks on rear also. on tire pressure he can get 120-210 left tire bite. the track we run @ has new track promoters so they let the track get dusty and black . each week it's different which makes it hard to have the right setup. the class we run has a 3000 pound weight rule but we had to as 200 lbs to help get tire bite. should he change his rear springs and make the heavier??  

Need some more info: Wheel weights and percentages, gear , what type of rear suspension, driving style, ballast location, engine . I have worked with some dirt cars similar to yours and was helpful. If you could send some more info  ; it would help in giving better advice.