Here is an English translation.
https://translate.googleusercontent....I1HFzrE5NZ3D6A
It also appears removing the front lip has a positive effect as well, though it is hard to tell to what degree.
I would also note that the shield doesn't appear to provide that much of a heat protection to the ball joint, judging from the distance of the shield to the ball joint itself. Are there discussion threads that would indicate otherwise?