The knuckle rotating is never going to push the lower control arm down. The weight of the car is on the lower control arm along with the spring. The only thing attached to the knuckle is the control arms. It's not like there is a spring or a stop on the upper control arm or knuckle that prevents it from moving further up. If it did then you could get the effect you describe. Now if you hit the stop on the shock while breaking then you could get an effect where the lower control arm is pushed down but that's not an issue unless you hit something.
Assuming the bushings are jelly and will squish to the point that the knuckle could reach 0-degrees of camber, the lower control would only push backwards parallel to the body of the car. It would not have an up or down movement on it's own. The upper control arm would push forward while also going up to take into account for the arc of the knuckle. Since the upper arm is shorter you would also get a change in caster somewhat as it would tip the knuckle towards the centerline of the car, however slightly. The movement to 0 degree's would definitely change your camber giving you a noticeable change in steering feel.
Assuming the knuckle did somehow rotate to 0-deg camber you would actually get some lowering of the vehicle. As you move away from 0-degree's in either direction you move the hub closer to the ground. So lets make some assumptions and do math.
Lets assume the distance from the pivot point of the lower ball join to the centerline of the hub is 8" (i'm only doing simple 2D math here. I'm too lazy to do real math). Now lets assume that at idle the camber is 7-degrees.
At 0-degrees of camber the hub will be vertically 8" above the ball joint. At 7-degrees you would be 8(cos 7) or 7.9404" vertically above the ball joint. The closer the hub gets vertically to the ball joint the higher the car gets off the ground. So if anything, and assuming the suspension deflects enough to get 0-degree's of camber, you would actually be lowering the ride height of the car by 0.0506". Yes, 50-thousandths of an inch drop in ride height is what you would have by the knuckle rotating.
But this all forgets about 100 things that go into suspension geometry. But raising the ride height of the car would actually cause more nose dive and weight transfer. Lowering the ride height is what would stabilize the car while braking.
I've never been able to tripod this car on flat ground. The chassis is stiff enough that I tripod all the time on hilly cures. I've actually gotten stuck on a steep driveway where the rear wheel came up. Had to let the car roll down and then taking a faster start at it.