Full Performance On Melee Combat

Hi, i know that there's a couple of threads around with the same issue .... but none of them reached the "best practice with full performance" ....

I already profilled It and checked many melee systems around Asset store looking for the mostly "right solution"... and i couldn't reach the "pro way" ...

WHAT I'VE ALREADY DONE TO OPTIMIZE:

1. Created the Layer HealthSystem (that collides JUST with the Weapons Layer);

2. Created the Layer Weapons (that collides JUST with the HealthSystems Layer);

3. Created the static Dictionary < Collider, HealthSystem > healthSystemsColliders;

4. Created the static Dictionary < Transform, HealthSystem > healthSystemsTransforms;

5. Created the static Vector3 protagonistPosition cached once every LateUpdate and shared with all AIScripts;

6. Created the public static event OnAttackDelegate OnProtagonistAttack that every AI assings to that, its own CheckForCollision(Vector3 _Blade, float _damage) method;

7. Created the public static Dictionary < Vector3, HealthSystem[] > battleMatrix that stores every HealthSystem position rounded to Int, then, updated within the dictionary constantly every LateUpdate();

APPROACHS PROFILED:

1. Sphere collider within "Protagonist" root transform on WeaponLayer, then a script with OnTriggerEnter() and OnTriggerExit() that manages the private "HealthSystems[] closestTargets and just upon Input.GetAxis("Attack") executes healthSystemsColliders[collider].UpdateHealth(damage);

   [Average Precision and Worst Speed]

2. Physics.OverlapSphere() JUST upon Input.GetAxis("Attack"), JUST on HealthSystemLayer to load private HealthSystems[] closestTargets and then execute "healthSystemsColliders[collider].UpdateHealth(damage)";

   [Average Precision and Speed]

3. Upon Input.GetAxis("Attack") the event OnProtagonistAttack(BladeTransform.Position, Damage) fires all assigned "CheckForCollision()" of every Active AI accross the Map checking if ((_blade - itsPosition).sqrMagnitude < 3f) then call "itsHealthSystem.UpdateHealth(damage)";

   [Worst precision but just Fast (zero physics)]

4. Upon Input.GetAxis("Attack") get a vector3 that corresponds to a point 1 meter towards the protagonist's facing angle, round to int the X and Z values, then call : battleMatrix[itsPosition2D].updateHealth(Damage);

   [Worst Precision but The Fastest (zero physics)]

Those tests where 30 AIs against the Protagonist and i don't know if there's something faster that i didn't try yet or something that i could do to improve/balance between "performance and precision"...