I can't answer your Guldstrand mod question as I have no personal experience with aftermarket control arms. it is my understanding the mod does not need to be done as aftermarket control arms move the ball joint axis to increase caster. Changing the control arms is one modification left on my to do list.
From personal experience, rebuilt stock front suspension, a little quicker steering gear and a fat sway bar really helps the front. I'm running Hotchkis 1 1/2" rear drop springs in the rear. Highly recommend them. Use good shocks. I cut costs using KYB gas shocks but one feels every crack in the road. The stock suspension leave something to be desired especially if running shorter aspect tires. I still encounter some lane change wander with 45 aspect tires. Never happened with 60 series. is ultimately my reason for a future control are swap. Also researching taller upper ball joints.
Don't know if you found the enclosed thread during your search. A wealth of info.
