Recovering hacked/stolen accounts is a very low priority for Theymos. There are accounts that haven't been recovered for over 6 months.
I hope you get your account back.
There's accounts that have never been recovered. Even high-level accounts take a while to be recovered, and the chances of recovering your account are there, but can take up to a year. Good luck.
Can you or anyone else verify my signed message is correct?
The screenshot shows that this address belongs to me from my wallet.
Maybe the reason for it not being resolved back to me is that the signed message is not in a form that is acceptable.
I do not know the process to do this.