Did you change your projectile script as I said?
Also, you did activate the mutator for FoundationTech (yes, I know, stupid question, but let's be on the safe side)?
You did fire it?
About the dTechs key, stock ships aren't affected (atleast, normally they aren't) and the drainer immune tech isn't standard for all ships (if it's 1, then it's immune to the drainer).