97 trans am ws6 suspension issues rough ride

So I have a 1997 trans am ws6 I've had it for 12 years I figured upgrading stuff was a good idea so 2 years ago I had koni orange srt shocks put on front and back and bought new gm springs online also had an adjustable pan hard bar installed and aftermarket tube lower control arms in the rear. My issue is ever since I've has this stuff replaced I noticed the ride is super rough wasent that way with my 27 year old factory stuff. I hit any bumps it shakes me all over and can feel everything it just seems like it's way to rough and now just recently the passenger side rear tire has a squeaky noise at lower speeds and I can hear when I grab the wheel and go up and down yet it don't seem like bad shocks cause it's still stiff feeling and don't bounce like bad shocks do. Any help would be appreciated cause I can't just keep changing parts especially the same parts. Thanks please help. I don't want to give up on the car but it seems like one thing after another