I have the same problem with a 777 when I go full brake. I checked the linkage in every way and I'm getting perfect braking, but it still taps the body enough to create servo bind at the end of the brake EPA (those Pro-Line bodies are pretty tight).

I did the hole trick and its now fine, but I still wonder why I don't see these holes on pro buggies (like Pavidis using the same Pro-line body) and we have to do them...