I suggest, if possible, to give favored enemy at very 3 levels instead of every 5 levels. So at level 1,6, and 9 instead of level 1,5, and 10z
With the server level range I think it would boost the power of a ranger by allowing them to be more useful in a more broad range.
I think it would also give some extra versatility.
I would love to see this, and I would definitely play a pure ranger with these changes.