I believe what you are seeing in the sidegap shim picture you've used as a reference is just a displacement in the kidney piece connecting with the ab piece. The other white bit behind the kidney piece is just light from a Star Wars panel from the set.
Soap and Water should get rid of the greasiness. If the brow is too low for your liking (it is for mine...) then all you need to do is trim the brow. No need to disassemble it. Without trimming it will pass ANH Stunt EIB just fine.