Let me tell you you can go up to 50 dex for an archer, some goes up to 70!
I have 50 dex and I see a lot more "MISS" when I get attacked then when I had only 3x Dex. I'm a kiter, I don't pvp, but I can tell you you won't regret 50 Dex. Don't hesitate in putting more points there.
I think your spare points could be given to str! So keep leveling ;P