OK...we're zeroing in the range now....
You don't need just one bevel setting ever, but you only need the bevel re-set once in a long, long while. Once a bevel is set well, if no damage is done, BUT you slip from (in your terms) uber sharp (in mine, comfortable and effective), then it may be time to go back to the hones, first a finisher (12k?) to see if you can bring it back with a simple refreshing, IF NOT, then to the 8k, and if not with it to 5-4k. In other works, you work at getting your razor's edge back by removing the least amount of metal on a finer grit stone and move back down the stone fineness scale.
Hope that makes sense. Otherwise you're just eating away the edge of a fine razor.