No, I agree that some raise would be unobjectionable.
But I sense that you might be contemplating hitting me with the sorites paradox: as expounded by Eubulides of Miletus, a heap of sand has a grain removed. Is it still a heap?
Of course it is! So remove another. And another. Still a heap?
The resolution of the paradox, applied here, makes it clear that DoL could have raised the level by a dollar with virtually no concern. by ten dollars with no real concern and the more that they raise it, the less defensibly they can rely upon the claim that the new level correctly identifies executive, administrative, and professional employees. Indeed, even their deliberative process shows a complete lack of careful analysis to reach this level: they simply doubled the old number.