Weighing in on the F-rack question (had a chance to peek at R3 while checking in at the hotel just now):
The SSDs of the affected ships (D6S for example) all seem to specify they could fire one drone per turn, or one drone per rack per turn with the B refit. Ships that came out before the B refit and have just one drone rack are not limited because only pairs of racks were affected by this rule. So, F-racks generally go on ships pre-B with 2 drone racks. The Taldren F-rack is, like many things, a close approximation of pre-B A-racks, but they fire half as quickly instead of the normal A-rack speed with a limitation on pairs. So, Klingons with F-racks get a slight disadvantage in that if they lose one F-rack, the other still fires at half speed rather than the full speed it would be able to achieve without a second rack competing for time.
About E-racks, I noticed the E3D has 2 of these. If I recall correctly, they use type-VI drones which aren't available for ship use in SFC, but only for fighters. The C-rack substitution seems like a fair translation in this instance, unless someone knows how to get fighter drones to work on a ship of the line. Heck, I wasn't aware there was an E-rack available in SFC until this discussion.
Can someone refresh my memory on X-ship drone racks (don't have that module with me)? Is there such a thing as CX racks? If so, wouldn't they be essentially like the E-racks people have described here?
On the Mirak X2s, has anyone tried testing a Mirak X with 1 heavy disruptor in place of 2 normal ones? I know the HDisr is a Klingon-only weapon in the stock Taldren list, but I wonder if it would help at all with the desire for more energy weapon crunch while also relieving some of the power drain? I'm just toying with an idea here, not being all that familiar with the HDisr stats after a long vacation from Xes.