Admonition is the king of defensive upgrades for the MC-30. Lando is the best insurance against big barrages, especially BTAvenger. Those two on the same ship are a big middle finger to your opponent.
However, how would you rank the best defensive upgrades after that for your second, third or even fourth shrimp?
Obviously this can be meta dependent so I'm interested in people's table experiences with them as well as how the maths breaks down.
Current thoughts on the issue:
Foresight seems like a reasonable next choice but I remember seeing some maths somewhere that you were better off with Advanced Projectors in a non Mon Mothma fleet.
Advanced Projectors seems like it was hit too hard by the XI7 ruling to make it worthwhile, but maybe not?
EWS might be helpful in mitigating attacks on damaged hull zones but on a ship that wants to double arc, and with an easy to hit rear arc, I'm not sure how useful this is.
Reinforced Blast Doors could be a lifesaver (even if it only gets rid of one card) but once a shrimp starts taking hull damage it might be too late to make this worthwhile.
Major Derlin seems like a possible option that will likely save about 3-4 damage over the course of a game, but takes up an officer slot.
Electronic Countermeasures is unlikely to be useful with the defence token redundancy, but is situationally useful against accuracy generating red dice volleys.
Cluster Bombs, heh, maybe useful if you know you're facing heavy squad builds. Super situational.
Redundant Shields seems... inefficient and costly.
Walex Blissex pairs well with Admo, especially if Lando is elsewhere, but I'm not sure of his value on a non Admo ship.
Mon Cal Exodus fleet is hamstrung by needing to engineer when the ship really wants to do something else, and also costs you Admo in another ship if you want to make the most of the synergies.
That's all I can think is relevant. What's your experience of using any of these, against what kind of fleets, and can anyone who is better at the maths provide any useful analysis?