I've been struggling with the exact same issues with the SDL.

I make all my measurements from the pavement to the inside of the fenderwells.

The front sits between 28" and 28.5" depending on load in the back.

The rear sits between 25" and 25.75" depending on fuel and load.

I recently changed the subframe bushings and differential mount and the rear ride height increased by about 1/2" or so. However, it needs to increase another 1 inch to look proper.

The front end needs to come down by at least 1 1/2 inches to look proper.

I am going to attempt to find "heavy duty" springs for the rear which offer a slightly higher spring rate. Hopefully these springs will provide the increase in rear ride height.

I am currently running brand new 19 mm spacers above the springs.