Yes, the downhaul was not stock. Can't remember the purchase now, but we were still class legal. A minimum of 16:1 is recommended today, since there is no class anyway.
The reason so much is not to have the power to downhaul, but to be able to uncleat the downhaul while on the trapeze. If less, the crew has to get of the trap to release it when the air lightens up.
Rick