Update:
I replaced the Track Rod Ends on Friday night, then took then car back for another laser alignment (using the correct vehicle details).
The car is much better now. No more scary feel and has returned to its original planted feel.
You can notice the ARB and Springs now, they give the car a more stable platform with much less body roll. As the camber is now more negative due to the slight drop, there seems to be the same amount of understeer as before; so I probably won't go for the rear ARB just yet.
The only downsides are that tramlining seems more apparent and travelling over a bumpy road is quite crashy. I assume that FSD's would be a good option to eliminate this.