Possibly a daft question, but they are both adjusted the same amount?
The difference could have happened when the hub bolts were being tightened (hub or shocker has slipped slightly)...i know the D2's have done that to me once before.
I find it better to jam something in between the hub and shocker (that suits the camber you want) to lock up all the movement, tighten then remove the spacer...that way both sides will deffo be the same.
I also suppose a slightly shorter shock on one side could be throwing off the camber...again my D2's cant be set to the same length as one side ends up slightly shorter once its all sitting back on the ground (engine vs gearbox weight i suppose). -- unless its just my coilovers haha.
Cant comment on your spax ones, but maybe a coupe of things for you to check 
Edit: Just checked the coilovers you have and I see what you and stani were saying, so you should'nt have the accidental movement that i've had from the D2's when setting up.
The adjustable bolts should work with them, as the washer will keep them put and allow you to rotate the bolts to desired camber.
