The rubbing is something that does happen, a fish tethered somewhere on some branches will be rubbing the hooklink/line as it tries to free itself. Thus the hooklink with snap. Leadcore and leaders are designed to withstand serious abrasion.
What you are doing with that rig is creating a 55lb breaking strain hooklink! I just think its totally unnecessary considering you can use so many other materials for the same thing, which have a lower BS and are less obtrusive and probably wont cost you bites from warier fish. It's very crude.
Just my opinion but its an unacceptable rig to be fishing with for various reasons. If I saw anyone using that rig on a water I fish I'd be reporting it to the bailiffs.
Again, same effect can be achieved with subtler and safer hooklink materials. They are readily available from thousands of suppliers. Get a very stiff coated braid and strip a tiny section back to get the 'flimsy' section and retain stiffness throughout. Line aligners and shrink tubing can create the kick if you want to use a combi-rig with a very stiff fluoro tied to a supple braid.