With headshot 6 and level 71 or 72 i am headshoting at blackfeather roost harpies, now, i am getting about 5 or 6 aa's an hour soloing them.

Headshot is the key to effective grinding as a ranger. You may want to take a look at EQ:Headshot for a good idea of places you would be soloing with your rank of headshot. I recommend a cleric mercenary as a "just in case" until you get a good feel for whichever camps you're pulling and killing. Once you're rarely getting hit, pocket the merc to bump the exp gain up.

Each arrow you fire downrange is another chance to trigger headshot, so find the lowest delay bow you can. It's not easy to get your hands on, but the Bow of the Destroyer has been the fastest bow in the game since Velious, and a prize for any ranger. Once you're headshotting in Dreadspire Keep, you may want to camp a Pouch of Curses, since you can also headshot with thrown weapons, and this provides an endless supply of 15 delay stones (but don't work with Endless Quiver).

Finally, Trick Shot is an AA you should keep maxed in line with Headshot, as it significantly increases your shots per minute.