Here is what I use to reduce the amount of trub from my kettle. I use a gooseneck manifold that rings the periphery of the kettle bottom and I use a ring of aluminum next to the manifold to help create a 'dam' to keep the trub from getting to the manifold. See below.
The dam is a strip of aluminum flashing that is cut to about 1" wide and is formed into a ring with an aluminum pop rivet.
The gooseneck is copper tubing and it is capped at its end and thin slots were cut near the end.
While the slots alone work fairly well at keeping trub out, I had a piece of stainless hose braid laying around, so I place that over the slotted section to help out.
I hope this gives you ideas!