Well, this sounds as though things are running smoothly. It takes time. It could go on like this forever or you can just bite the bullet and let them alone to work it out. It doesn't sound as though either kitty will fight the other one until death. I would be tempted to let them at each other all day long and keep them apart, if necessary, at night, so that you could get some sleep!

I have found that by playing with both cats at the same time, with a very exciting toy, they sorta learn to "share"...taking turns swatting at the toy.... a fishing pole thingie is what I have in mind.....something that they both cannot resist playing with.......

It sounds as though things are fine there.....good job!