DIY Power cables..Are metal end plugs better than plastic?

I made some cable ps using DH Labs Red Wave wire and bought some SonarQuest end plugs. They are nice but feel a little cheap plus I do not like how the strain relief adjusts to my cable wire jacket. The cable is about 16mm thick and it’s to large for the extra strain relief for a smaller type cable so it kind of gets off centered. 
Who makes some nice plug ends that don’t cost a fortune that are maybe made of metal or better material that has better strain reliefs built in?