I prefer high capacity over double shot as they both have the same damage per magazine, but high capacity gets far more shots. Double shot does empty the mag more quickly, but I've found high capacity to be fast enough. I mostly do PvE though, so your mileage may vary for PvP.
I've only tried the OC versions so I can't really compare, but for whatever its worth I liked the fixed over the gimbaled after engineering both.
I engineered 4x OC Screening frags for my Chief and I'm loving them. On the large slots I went for a pair of OC PA's (which are delightful), but I've had so much fun with the frags that I'm tempted to put them in the large slots, too.
I'm a fan of fixed for frags, too. I'm interested to see how frag turrets work, though. I'm curious about what range they'll attempt to engage from.
Why not Double Shot Screening Shell? For ammo efficiency?
Every pellet that intersects the power plant hit sphere while it's at 0 probably triggers its own roll of the dice.I'm feeling that for some reason frags have a better chance at tripping a PP kill than anything I've seen to date. I've had several big ships explode before 30% hull using frags since I equipped my Chief with them - yesterday.
I don't think it's necessarily a fix percentage chance to pop per hit. I've noticed a VERY high chance to kill 0% power plant ships when hitting the power plant with two inline large short-range (+75% damage) modded plasmas (chieftain). Took down many big ships at 90%+ hull. There definitely seems to be a "how much overkill" component involved.Every pellet that intersects the power plant hit sphere while it's at 0 probably triggers its own roll of the dice.