Unfortunately, I did not read the original post about Joey, but I've had to work very hard with my Willie who developed dominance aggression, food aggression and deferred aggression at least partly in reaction to my female who was picking on him, kicking him out of all his sleeping spots, and then finally attacking him to the point where I thought she'd kill him if she could (she's very sweet with us). But maybe it was always partly there and her behavior just brought it out.
I worked with a behaviorist and he's about 95% perfect now - my daughters and I do great with him, but I still have to be alert (one daughter is sleeping with him on the couch right now, but if my husband went up there, he'd growl at him). I've never seen any of my basenjis slink, but I have had dogs that "sneaked" and would adopt that sort of posture.
I give Direy a lot of credit. It's scary having an aggressive dog. I have 2 girls in the house and my son visits (he still gives him a hard time too). The girls really pitched in and did their work with him and he adores them. They know how to handle him if he gets snarky about something and they know how to anticipate him and with good behavior modification techniques and lots of hard work we have a dog we can really enjoy again. But yes, they are not domesticated like other dogs, and since we've had this issue with him, I never assume that I can just think he's totally over it.
Good luck Direy, and don't give up. It takes time, but it's worth it. Behavior modification works well and all my work with Willie has been hands off, treat rewards and claiming my space. If he snarks I step towards him (as Cesar says, calm assertive).