In regard to ride height changing for tires, you should always adjust ride height back after a tire change.
The shorter a tire gets, the less leverage the bottom of the tire (contact patch on track) has against the hub/spindle hinge pin fulcrum (think longer bar == more leverage) as the car is in a corner. This results in less ability to pull the camber link outward toward the outside of the corner and produce chassis roll. Raising the ride height up, as we all know, increases roll, so correcting ride height in this case replaces some of the lost chassis roll.
Wayne