[AngleWyrm]

Tmcc,
Combat sensors were at level-6 (out of 21 max) during my tests, providing a 15% bonus. Both ships in the tests I ran were level-3 Destroyers, rated at 22% defense.

Parasite,
PD Cannons have a max level of 100; at that level they would fire ten times per second at incoming missiles, doing 20-33 damage per hit. The missiles at max tech of 100 would have 230 hitpoints each, and -230% defensive bonus (on top of seeker defense bonus).