My suggestion for Advanced Countermeasures if you don't have a good thing for it in the design space: Yank it.
There are four other defense-focused skills: Damage Control, Impact Mitigation, Defensive Systems, and Evasive Maneuvers. And a defensive perk in an otherwise offensive skill: +50% weapon hit points in Ordinance Expertise (although it pales next to the similar one in Evasive Maneuvers). Plus four other skills that help survivability: Combat Endurance (the high CR buffs), Helmsmanship (speed), Gunnery Implants (range in general, and accuracy helps PD a bunch), and Power Grid Modulation (capacity and vent-speed).
I think the pile of defensive skills available can maybe stand to be one smaller.