I have fought this battle on a number of occasions and would like to suggest this; order springs with an inch or so MORE lift than you want. Because it is difficult to judge exactly how high the new springs will raise your rear compared to what you have now.

If the new springs are too high, it is easy to use some spacers to get the rear down where you want it. Then there is the chance that the springs will settle at least a little. Then you can pull the spacers and you are back where you want to be.

In other words, too tall is no problem to address. Too low and you're back to the same old issues.

IHTH