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Because it is next to the flower bed you are worried about settling. Anything you can do to strengthen the edge of your base is helpful. The wider you can go the better, although you need a root zone for the planting which limits you here.
One thing we used to do when I actually was building these things was to use geogrid in the base gravel. We did this to bridge soft spots, like over water line trenches on new houses. It will strengthen an edge as well, but you have to use a wide sheet of it (not just something skinny along the edge).
I learned this at a Keystone seminar in Spokane about 12 years ago. The instructor had a box with removable sides. He put gravel in, then a layer of grid, and then more gravel. Then he removed the sides and the gravel sat there nearly in the same cube shape as it was when in the box.
If you put a couple of layers between lifts, I think it will go a long way to strengthening that edge. Hopefully, you can go somewhat wider than your paver edge.
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