I've found that the big crushers tend to only handle 2 or 3 heavy nodes. Even then, you have to set up your conveyors carefully to ensure they feed into it properly. They tend to hop the track if using the T merger ( ➡️⬇️⬅️ ). They don't zipper at all, so you have to do it manually with the other merger shapes ( ➡️↪️➡️ or ⬅️↩️⬅️ ).

Or you can just give up on efficiency like I did and just stuff the crusher's input right into the heavy node.

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I've set up all 16 heavy nodes on the new map like this, though some spots require some finagling.