Stiffer front coils?
 

hey i have a 1997 mazda b4000 with a 4in bds suspention lift and i recently built a winch bumper. the new bumper lowers the ride hight because of the extra weight and throws off the alinment and causes bump steer because of the twin i beams i was wondering if anyone new if you can get stiffer coils to fix this or if you have any other segestions?