Sorry to hear your guy isn't doing any better - is he eating/drinking/pooping okay? The triple antibiotic ointment sounds like the right product. How did you wrap the toe, what steps have you taken lately?
From this point, I would treat it like a regular bumblefoot wound; soak him for 5-10 minutes to get it really clean, gently pat dry, apply a good layer of the triple antibiotic ointment all around, then I'd add a nonstick gauze pad, cut into 2 strips (like a plus sign) to wrap the stump, then cover & secure in place with vet wrap. I'd leave that on for 2 days, then check it, and retreat/rewrap if the stump still looked fragile. I'm not certain when you should consider administering an antibiotic medication.