The extra washer thickness was probably a good decision to compensate for hub variations in replacement discs but wasn't needed to compensate for wear. The hub won't get any thicker and the disc will wear thinner. The pressure plate fingers will come back towards the TO brg as the disc wears. You'll hgave to make a note of the changes ( dimensions) in your car diary so future owners or you won't have to go through the pain when replacement time comes around.
Keep us up to date on the rear axle issue also.