The new Melee Trace Plugin, does not require collision to apply damage through precise hit detection Melee Tracing Plugin in Code Plugins - UE Marketplace
However, it requires to setup a “Weapon class BP”, which is spawned, and traces can then be triggered from firing anim notify events inside that Weapon BP. Currently try to figure out how to combine this hit detection solution with ARPGIS. I highly recommend to evaluate this plugin, and to possibly make it compatible with the new WeaponSpawn, and ShieldSpawn. Pm me, can email you, or we could Skype/Discord if needed, would be happy to make this work.
The bottom line is, when it comes to melee combat, hit detection is often difficult to setup through collision spheres, a tracing instead does not require any collision spheres, while at the same time offers precise hit detection.