That body looks really similar to mine, both the jack routing and the neck heel look exactly the same.
I'm relieved that at least mine isn't fake.
Thanks for your help!

If that body is yours, could you please measure the neck pocket and neck joint? Just so I could make a better shim with the exact measures.

Edit: Here's a pic in case I couldn't explain very well
https://imgur.com/oB5aJay