Yes S3 is closely tied to your overclock, they are trying to work it out. My Boards BIOS they have finally got it, I can resume at any Blck (Only used 190-211 though)

And yes, they are still working out the Qflash issues as well. That is not a reason to not use a newer Beta, just keep in mind if you want to go backwards in revisions you will need to use FlashSPI. I'm using the latest Beta, guess I should test if the Qflash issue is present, but I have not found a reason to go back so I just had not tested that yet.

If S3 is that important to you, I would advise you try out the latest Beta. Or like you said, you will need to wait for a final