Healing is a main advantage of humans, and it is the most OP thing in the game.
A better way would be to reduce med pack healing (leave the WA arms and Aspida as is). Consider that a soldier with a disabled arm can be healed by a WA arms or Aspida so can still use the normal 4AP that turn. In this case the disabled limb didn’t even slow him down! Healing should cause “daze” to force at least one down turn. AP consumed by the healer should be applied to the recipient as well. An Aspida 3AP super-duper-golly-whooper full heal would leave the fixed up soldier with just 1 AP.
Applying a med kit could still be 2AP, but any healing causes daze. How about that?