My thoughts are to go maybe 1/2 inch or so down in the front and 1 to 1-1/2 inch down in the back to bring the car slightly lower and level.
I've read in the past the leveling the car can improve handling.
I am not looking for a radical shift but a subtle shift, partly for appearance.
I am assuming the shims are in the back too? I've only done work on my front springs.