Yes, it is backlash, I was initially referring to the USA importers comments on quality control issues which mentioned 'lifting'. The GH-Pro, well mine at least, suffers no lifting, though I did find the "two small screws" that any lifting can be adjusted with.
The backlash could be considered an issue, and if I had paid $1,400-$2,000 I would demand none, but this isn't a $1,000+ head and despite the backlash the head holds firm and I have seen no image degradation due to lack of support despite the fact that I am probably using larger than optimal gear setups on it.
I do feel a relatively simple redesign by Sunwayfoto would make the head considerably 'better', as I said the transverse movement lock shaft needs to be a through shaft ,and the actual neck of the head going up to the quick release plate should be built thicker. But even with those comments made, I still think the head is a good option compared to other smaller geared heads and well worth considering by those people looking for something like it, I am happy with mine at this point.
I can well understand this head not suiting many who are used to the Arca Swiss level of quality, and their $1,400 clones, it is a different tool. At $399 I think it is worth a look for people interested, if Sunwayfoto came out with a MkII with my suggestions I'd wholeheartedly recommend it even at $499 and I would upgrade.