Regarding the Warpshot Repeaters: I've noticed they completely fail when used against missles flying perpendicular to the ship.
Most notably, the engine-kill EMP missiles that approach from the front, then circle around the sides, before hitting the engines. The Warpshot Repeaters can hit fine during the approach phase where the missile fly straight towards you, but never hit during the stage where they pass the ship to reach the rear. Or any missiles passing beside the ship for that matter. Even at relatively shallow angles (mostly going straight towards you, but aiming slightly to your side to pass you), they fail to hit completely. This is the case both with and without the "100% target leading accuracy with autofiring weapons" skill.
I'd recommend either tweaking it to fix this issue, or if it's not possible, re-classifying it from a PD weapon to just a regular gun.