The primary limitations on anti-missile performance are the number of missiles that can be fired at a time and the range of the fire control radars for semi-active homing missiles.
The previous doctrine had all ships firing one missile at a time from each launcher... fortunately Amizaur was able to work his way around that in the doctrine and introduced moderated salvo fire (moderated because the ships don't just fire everything they possibly can at every possible target), which means that ships will fire appropriately once the targets are within range depending on the target type and the type and number of launchers.
The fix to the FCR's was a quick fix (the radars all need to be redone) to bring the AEGIS performance at least up to the FFG. The Mk92 in the stock database is MUCH longer ranged than the AEGIS FCR's, so I set them equal to quickly rememdy that problem, which means the AEGIS ships will now engage at a reasonable distance against ASMs.
In terms of the other ships, and the fine tuning of the performance, yes these all have to be done... however, right now it involves importing database from the Harpoon database and this takes some time... anyone else know where I can get a complete range table for all modern search and fire direction radars???