Maybe move AMS towards something akin to like how Starfire handles mass AMS fire verse missile swarms...
Then again, even with capital C3, it still doesn't compare to the missile bombardments of that other game... in addition, short of custom warships... most of the canon warships don't have massively layered AMS systems nor do they mount capital missiles that have a throw weight in terms of missiles fired per turn and damage dealt by the warheads to really call for a mass revamp of the current AMS rules.
Now, if battletech started to produce warships that mounted canonical warships that had throw weights of 6 to 8 Killer Whales per turn and a way to datalink 4 to 6 ships together to pour 36 to 48 missiles a squadron a turn into a single ship, perhaps AMS would need revamping. Then again, unlike the other game, there isn't the preponderance of external ordinance for both capital ships and fighters to warrant such a change in AMS rules. That other game would have fighters capable of hauling 4 to 6 anti-capital ship missiles (akin to the anti-ship missiles from TacOps)... but at best, the best missile truck in B-Tech is a 3 on a 90 ton whale of a fighter. The idea of using fighters as a stand off weapon for capital ship/drop ship missile strikes isn't there nor backed up by the rules enough to try.
Till then, I am satisfied with the current AMS rules.