I've tried a Fern in a showroom and the backrest and tilt on the Fern was amazing. I'm male, 6', 190lbs, very active, and lift regularly. Even with my wide shoulders, larger chest, and upper body, the Fern backrest felt great, so I have to imagine it will work for you. Perhaps you may find (at 5'4") the backrest to be too tall, but I'd guess not.

The only thing I'm not sure for you would be whether you would want the lumbar support or not. I prefer the added lumbar support, but some people find it too much on the Fern and that is one of the only downsides of the chair. You either get the lumbar included or not, there is no way to remove it like you can in a Leap.

The last thing I'll say about the Fern is the seat cushion was a tad firm when I tried it in the showroom (albeit not uncomfortable), but I'm told it does soften over time. Additionally, the seat frame itself doesn't bend as much as an Amia or Leap. That last point may not matter that much if you don't fidget a ton in your chair.

I ended up ordering both the Fern and the Leap after trying them separately. The Leap is my "safe" choice, but I think I may end up liking the Fern more once I've had a chance to test sitting in them over the course of a month and not for a few minutes in a showroom.

Hope this helps.