I wish I could help too. I've had three ferals in here and two came around very, very well. I've still got two of them and one is very jealous of other cats so no more kittens for us till I can set up a place to separate them. And then if I do, sadly, there are more than enough ferals, strays and dumpees in our village, I don't have to go far looking.
A note to give you all a laugh. My OH and a neighbour lady are putting out food for some ferals. A month or so ago he got a good look at one. Black and white. Guess where the white is? Yep, it's a stripe.