You're much more likely to over-stress the CV by turning sharply than you are by any reasonable amount of suspension droop. The front wheels have a maximum turning angle of around 30 degrees. To get that much of a CV angle with suspension droop would require a droop of about 7-8 inches from horizontal at the wheel. A 1" spacer isn't going to get you to that point. You'd have to do a roughly 4" spacer-only lift to get those kind of angles.

It's also worth noting that preload does not change the stiffness of a spring. Stiffness is set by spring materials and construction. Consequently preload, whether done by raising the spring perch on the shock, or by inserting a spacer at the top of the shock, does not change the ride at all unless you shift the ride height so much that you are hitting the bump stops or exceeding the shock travel. As long as the preload does not exceed the vehicle weight (which case would prevent the suspension from getting off the lower stop), the spring operating point does not change, regardless of preload. It is still the same stiffness spring, and it is still supporting exactly the same amount of weight, therefore its loaded length will be exactly the same as it was before the preload change.

Preload does bias the suspension operating point away from center. Where spacers and other lift options cause trouble is when the suspension nominal operating point is biased too far from its center value, causing the suspension to frequently hit the stops on one end or the other, or causing the spring to go into coil bind before the stops are reached. As long as neither of those situations occur, the ride should be indistinguishable from the non-preloaded case.