Does the GTI have a factory camber adjustment?
Unless something changed on the MKV's and later, you have "shared" front camber, which is increased when you lower your car. Your camber will depend on how low you are, and the best they can do is "share" it equally among the left & right side.
In other words, your front camber & caster is not adjustable, other than what you are left with after your lowering efforts.
You should be able to pick up some camber plates though.