[steveproracing]

Put very simplistically
Longer links = more roll. Ie feel softer in the corner
Shorter links = less roll. Ie feel stiffer in the corner

Take a turnbuckle of set length and move both inner and outer ball further out the more rotation u will get.
The further in u move said link the more the rear end will feel locked in


Ball height is what alters camber change
The lower the inner ball / the higher the outer ball the more camber change u will have.
As regards camber change the main objective for this is to stop the wheel outer wheel going positive in roll mid corner
Ie when the car is cornering and is rolling over and putting its weight over the outer rear wheel u don't want that wheel to have positive camber at that point.
You can't measure this correctly but u can guess u are in the right ball park by turning the front wheels left then grabbing the car at the rear and twisting the car to the right to simulate weight transfer then see if the right rear wheel has not got positive camber. If your wheel has positive camber u need more change


Hope this helps