I'm sorry to hear that you've hit a dead end. You could try to send an e-mail to Gene Spinelli K5GS. Gene has the logs on his laptop. Although I don't know if he's authorized to update the log. It's worth a try. Gene did personally work many of the 40m SSB contacts. GL.
Now I need a small favor in return
I have a 40m QSO with PT0S that's on their log but not confirmed in LoTW. I have sent multiple e-mails to the team with no response. If you or anyone could help me on this I'd appreciate it.