How are the pavers undoing the aprons effectiveness? I have cement pavers anchoring my run down and have been very happy with it.Your pavers are undoing your apron effectiveness - the apron needs to extend 18-24" beyond the solid edge, in this case, the pavers, not the run fence. Better off removing the pavers and using landscape staples to secure the apron, or extend the apron even further.
Even a small hawk can take a chicken in pieces, in their stomach.
There was a thread about those ball cages... https://www.backyardchickens.com/threads/chicken-orbs.1524278/