Oh yeah, more...

The spring acts right, handles right, it is just a bit deformed and therefore lower, so I'm betting that if it is sagged 1/2 inch now at 1.5 inces lift, it'll still be sagged 1/2 inch at 3 inches of lift (16% compared to 33% of the overall lift.)

Well, yes, maybe. It depends on the add-a-leaves. Frankly, they are a poor way to lift the rig, but they work. New springs, added springs (like DOR's Spring upgrades) or even a rearched pack (still not a great idea) will give you a much better lift and performance (read: ride, at the least).

Frankly, I really would not worry about the difference in height. If it bugs you that much, find a donor pack (or two to keep things equal) and swap it out. But, in the end it is just a minor irritation.

As a warning, some of your front alignment is dependant upon the height of the rear. Changing that, will also change the alignment to some degree. I think you were planning on doing the move to 3" all at once, but it is something to consider.

The best plan is to decide upon exactly what you are going to do in the rear, lift it, crank the front and head back to the alignment shop. Then, everything will be correct.

Good Luck,
Michael