A7s Custom White Balance Is Bonkers!

Going through the help guide and found this.
  • Setting [ITU709(800%)] or [S-Log2] may cause an error in the white balance custom setup. In that case, set the exposure bright first and then perform custom setup.
I guess BRIGHT means oh 5 stops? I'll try that....
 
Has anyone else been experiencing this problem and found a solution other than returning the camera?

Here's what I'm getting:

 
Custom WB in Slog doesn't work well. You can try adjusting the exposure (open up), but it's still hit or miss, mostly miss. Switch to another PP. And yes, it's a small pain in the rear. Hopefully they can fix it with a firmware update!
 
Adjusting exposure doesn't work for me most of the time.

My solution, which sucks but is not the end of the world, is as follows:I have my shooting setting (Flaat, based on slog2) on PP1, then on PP2 I have a profile based on Cine4 but with b/w color; when I want to set custom WB, I switch to PP2, adjust PP, and go back to PP1. PP2 has to be monochrome, otherwise I will often forget to get back to PP1 before shooting.

A measure of how stupid this issue is, is that WB works with b/w color but not with s-log2 gamma.
 
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