Bulldog bone works on various line diameters easily, will run (jerky but moves) with pitch, easy on and off rope for effortless redirects, tends smoothly, works SRT and dDRT with no changes.
I really can't recommend it highly enough. It does everything the other devices do and then some
Have you tried 6mm ocean Vectran for the hitch? It's my favorite, allows for a super short hitch. I use a 3 or 4 wrap michoacan that is only about 4 inches long. Maybe an easy way to compact the setup a bit more. Maple Leaf Rope still carried it last I checked