Clagnar is Correct. Get double slice early. Then get power attack, you want to have both by 7th level if not 5th.
With a Ranger of this type at high levels there is no need to ever have a dex over 15 unless you want more AC. Your stat bumps should go to strength as a strength based Ranger. Strength will improve your to hit and damage, and allowing you to power attack more often and improve the value of double slice.
The builds that rank double slice low are for 14 strength or less. AS soon as you are at 18+ strength Double slice is a high priority. When you wear a belt of strength the value only greatly increases.
Don't worry too much about ranged feats. If you have to use as a back up you are likely talking about flying creatures so you wont need point blank (not close enough), wont need precise (not in melee) etc... just get a composite longbow with +4 strength and you'll be doing enough damage and enough to hit to be fine. It is a backup weapon. Double Slice and Power attack are more important to your core build.