I hope you have luck with it.
The only other advice I can give, is that you need to be the one to do the hissing/scruffing (correcting her for her agressive behavior), at least at first. Your DH does not need to get involved with that, at least until she starts to accept him (otherwise she might think he is being agressive towards her).
I would have your DH try to play with her (try the toys on a string, they are my cats favorites and the cat doesn't have to be right up near you to "play" with you) and reward her (if she has a favorite treat?) whenever she is close to him and is behaving herself. Hopefully this will start to build some good associations between her and your DH (i.e. DH = playing with my favorite toy and getting treats). You can supervise and only correct her if she acts agressively towards him.
Other than those play sessions, I would say that your DH needs to basically ignore her. It might be a good idea though, to keep treats or toys handy so that she can be rewarded if she approaches him (in a good way) on her own.
Hopefully, once she gets used to him via the play sessions and understands that agression is a no-no, she will accept him. At that point, if she is responding well to your corrections (knows that the hissing+ scruffing = mom doesn't like what I'm doing), then your DH can try hissing at her when she starts to become agressive (i.e. looks like she's going to pounce on him) and then redirect her to a toy.
Some of this *might* be regular kitten-play behavior... I know that one of my kittens (that has been adopted) wanted to play very rough with me and my family...biting, scratching, latching onto my hand and "kicking" me, etc. He quickly learned to redirect this onto his feline brothers though (when I did the hissing, scruffing, etc.), but was still rough with them...
Did your DH or other children play rough with her when she was smaller? That would fit (and explain why she is that way with some and not with all), but my boys don't usually "hiss" at each other before play-fighting.