It turned out that there was quite a lot of improperly installed components that led to suspension problems and required quite a few replacements.
These are things to watch out for if you do a DIY lift kit install or have had one previously installed to ensure everything was installed and checked over properly.
Some components were replaced but the previous installer did not replace the front sway bar bushings which were completely deteriorated :

The front lower shock (rubber) bushings were worn down (too soft) causing the shock to vibrate :

Front upper shock bushing washers were mounted upside down - left side :

Front upper shock bushing washers were mounted upside down - right side :

Ball joint spacer is forcing the ball joint to roll/buckle inwards causing premature wear.
A properly tapered balljoint spacer will prevent this from happening :

Front upper bump stop was not removed or trimmed down.
The upper A-arm literally sits on top of the bump stop preventing downward suspension travel. Can be dangerous when going fast over bumps (front wheels would be getting air instead of being pushed back down on the ground) :

Rear shock is extended (19.5 stock length) and will cause it to top out when the rear droops down :

Rear lower shock bushings/washers are installed upside down pinching the bushing :

Rear brake line is stretch to it's max length. It should have been lengthened or the tank bracket removed :
