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Also, you do not have to shoot at each individual missile. A shot that hits is considered to hit the 'volley' as a whole. Also, no need to roll damage. DST has as a house rule that any hit on a missile is sufficient to destroy it.
Missile Rules:
Shooting down missiles:
Missiles are -10 to shoot down before strike bonuses are brought in to play if using lasers or non-high explosive ammunition.
Missiles are -5 to shoot down before strike bonuses are brought in to play if using high explosive ammunition (HEAP does not apply), high explosive missiles or plasma missiles.
There is no penalty to shoot down missiles if using Air Burst Munitions or a fragmentation missile(s).
Note: If you hit the missile you 'kill' it. No need to roll damage.
So your First roll, the 2, missed. But your second one, a 9, beats the enemy roll of an 8, and your +11 to use head-lasers handily nullifies the -10 to shoot down missiles using said head-lasers.
If allowable, I'd use the last three rolls to shoot at the enemy (or the missiles heading towards the others).