Problem of AMS is not low effectiveness against LRM.
Problem of AMS is that it demands so much sacrifice in mech build, that even if it would give you total immunity against LRM, it still would be hard decision to take or not to take AMS.
So
Make lower sacrifice for build when you take AMS. To the point of being AMS totally free in tonnage and slots (taking 0 tons and 0 slots)
OR
Keep the sacrifice for build when you take AMS, but make AMS useful on its own, even when there is no missile to shoot down. Give AMS a switch(like for ECM), which you can change in battle, which will activate AMS to be able to automatically target enemy mechs and do damage comparable to machine gun (on top of targeting enemy missiles, prioritizing missiles over enemy mech, if both in range at same time)
Edited by brroleg, 18 August 2018 - 07:51 PM.