Hey, kanonka, welcome to MobileRead!
I think the issue you're having with the PDFs may be that you've set the page size, correctly but not the
paper size -- I'm not sure how to suggest you do that, since I don't know what program you're using to make your PDFs.
If you're feeling brave, you can try replacing the fonts on your Reader with ones that include your 'extra' characters, and then you wouldn't need to worry about the PDF thing at all.
You can find info on that in
this thread, but read it carefully, it won't work if you don't get the Fonts arranged just right (the thread will cover that).
Good luck and let us know how it goes for you.