 I would try to make your home as distracting as possible. I would bring in cardboard boxes every day. They're free and you can get them in any store. Paper bags, organic catnip, grow other organic plants. Be creative with the boxes. Cut holes in them. Put one on top of the other. Make a duplex, a triplex. In other words, the more things there are for the cats to explore in the home, the less focus they're going to have on each other. And little by little, their tolerance level with each other will expand. But right now, as long as there's no physical contact, I would leave well enough alone.