Ajax,
Bounce could be very hard imo. Can't plummet in a straight line for so long and then brake or turn around gently.
Conservation of momentum, or something. Could see 15/lb again. A 4/lb bounce after that descent would not take much.
For what is is worth I am better on nickel, rather than Cu/Zn. Was tempted to diversify more but decided that was yesterdays (May/june) wise move.
EL