he's amused/interested in her for the same reasons that martin was sometimes intimidated

And yet Angus was typically dominated by Faye, the same as Martin, just not as obviously. I don't think that Faye will ever respect someone who permits her to push him around, no matter how much she likes him.

You are right though... the combination of her and Martin would ultimately be toxic. It's hard to not feel bad for him, though.