About the drone stations, I'll have to check the script. The ASF response should only be against T3/T4 air units. The ASF response script is separate from the regular Air script, and does not reduce the amount of other air spawned.
The EMP launchers were a unit I introduced in a much earlier version, and no one ever really used, so I never bothered to balance. I am aware of their OP nature. The missiles cost the same as regular Tacs, as I never edited their costs. I was considering removing, as the Sera T4 Tacs are their balanced replacement, or making them a special weapon only unlocked after achieving a certain goal.