Advanced Thaumaturgy + Explosive grenade

Additional effect from quality says fires +2(0-2) Projectiles, while sitting on 29% Quality.

in this case:

Skill shoots only 2 grenades, 1 basic + 1 from quality(?)

Its worded as it should shoot 1 grenade as basic and 2 additional due to quality.

Skill with 6% quality (only from ascendancy) is worded:
Fires +0(0-2) Projectiles.

and it shoots 1 basic grenade.

Skill with 11% quality (6% from Ascendancy + 5% from one gem cutter) is worded:
Fires +1(0-2) Projectiles.

and it shoots 1 basic grenade.