This is out of the Lovells catalogue.

I was fitted with FFL-46 at the fronts and FRL-101SL at the rears. The front springs are for non XR Falcons and the rear springs are for AU Falcons. According to the catalogue I should have FFL-27SL for the fronts and FRL-42XSL for the rear.
Maybe thats what's causing the difference in height from front to rears.

All sorted now. The FFL-46 is not a variable rate spring and is slightly more stiffer than stock XR springs that was why they were used. The rear springs are correct as the Koni shock used is the same for EF/EL and AU for the rear.

The front shocks are going to have the circlip for the lower spring landing taken to the next one down which is another 10-12mm which will make the car even all round.

WA Suspension Centre do great work and I can't recommend them enough for people in Perth. One of the guys there rand me today and explained the spring choices and all is sweet now.