I can give you some figures from the W126 as a guide. Might help a bit.

When I started with the ride height on the SDL, the fenderwells were 24.75" from the pavement and the camber (rear) was negative 2.5 degrees. The vehicle was definitely sitting a bit low in the back.

I installed new custom springs that were slightly longer than stock (aftermarket stock springs didn't raise the ride height at all) and the ride height increased to 27". This is a significant change and the vehicle rides a bit high in the back with no fuel or baggage.

The rear camber is now just slightly negative (about 1/4 degree). The spec begins at 1/2 degree, so, a thinner pad would be preferable for it.

So, for the W126, you get about 1 degree of camber change for each one inch change in ride height.

Also, note that there is a multiplication factor for the spring pads. If you change from a 14mm pad to a 19 mm pad, the difference of 5mm is compounded by the leverage in the suspension. In the case of the W126, the ratio is approximately 2.5:1. So the height of the vehicle would change by about 12.5 mm with a pad change of one size. This would equate to about 1/2 degree of camber.