Tuco, I couldn't get the hack to work for me. I did find the correct DB entry and modified it from 4 to 6, but after saving the game and then attempting to load the game in BG3, I get a message when I start saying that the file is corrupted and then the game hangs. I saw that someone wrote a post that it might only work on a save with 3 or less in the party and tried that save, and the same thing happened. Others posted on Nexus indicating that they are having the same issue, so I don't feel that I did anything wrong. Any thoughts?
Did you test if it makes any difference between DX11 or Vulkan? I'm currently using the former, for the record.
The warning message about tampering with files is never going away, by the way. It's one of the downsides of not having a native option from Larian I guess.
Because apparently they aren't just happy with denying to the user base what we are asking for, they also feel to urge keep nagging us about "doing unauthorized stuff".
Also, I had the same exact problem you are having with Patch 5 (even if in retrospective it may be related to the fact that I tried to edit a save while having a full party of 4 already, who knows...) but it's working smoothly for me in Patch 6, so I can't really help.