I'm having a lot of trouble figuring out how to calculate the Monk's attack bonus, for some reason it seems stupidly low.  

If an attack power has the keywords **Full Discipline**, **Implement**, **Psionic**. The power uses Dex and the attacker has a Dex modifier + 1/2 level of 4.  The attacker is attacking with a magic dagger +1.

The total Attack bonus I come up with for power's like Crane's Wings and Open the Gates of Battle is +5.

Are my calculations correct?

Does the monk always have what seems to be a low attack bonus? 

Because he targets other defenses?