The 4.3.4 client doesn't read patches from the Data folder that are higher than 15595.
No, no no no, that's wrong.
I have a patch named wow-update-base-200000000, no problem with that
Be sure you have applied max limitation fix on your wow exe, you can do it manually in exe but you need the offset, you can find this on ownedcore, stoneharry thread.