Firstly, make sure you are using the new template.
Secondly, the "damage" parameter in the template doesn't change the amount of damage the enemy gives. It is only used in weapons and debris. In order for the enemy to cause more damage you will have to change his "weapon" parameter (aka what he's shooting).
As for the health, I'm not sure. Increasing them both should make him tougher. Then again you could base the whole thing on a cog so you can control everything from what he shoots (all 15 projectiles) to his "shielding" (messing with the "damaged:" message).