I believe that you will have a big challenge in getting your bump steer to go away as well as getting good handling quality with the significant difference in ride height between the front and rear axles. I would suspect that removing springs in the rear and adding springs in the front would not result in good handling either. GM engineers did know what they were doing.
Get it aligned by someone who knows what they are doing.
A good indicator that you have found a guy who knows what he is doing will be that he will tell you right away that an alignment probably won't help very much if at all.
