Setvectorup works as follows, the direction specified goes up.
So [0,0,1] (max Z) is sitting flat,
[0,1,0] is balancing on the nose of the vehicle,
[1,0,0] is resting on the righthand side.
So, using trig we find your 10-15 degrees as .173648177-.258819045.
This this means if your missile lies down when spawned type :
setvectorup [0,.17365,1] for 10 degrees or
setvectorup [0,.25882,1] for 15 degrees.
Setvectordir I have no idea about.
Luke