If you cannot find an instructor to teach you spins in your airplane,
find one that will teach you them in their airplane. Then you can go
out and spin your airplane. Don't spin your own airplane just because
you couldn't get an instructor to show you how. Donnot compromise on
this. There is no need to spin an airplane. Just don't spin it. Flying
involves being able to say no. Sometimes you have to say no to
yourself. It is called resisting temptation. Learn how to do it. It
will make you stronger.

As for the incorrect paperwork. Welcome to the real world. A long time
ago I found that I could not change other peoples behavior (I have a
hard time changing my own). I cannot change how the world works.
Therefore I must adapt to how the world works. If mechanics put
incorrect paperwork into your logbooks, stop that from happening. Find
a way. I gave you my way. It might work for you. There are other ways.
Find one.