comp force drop - 1st run to 2nd
     - 2ips = not much?
     - 5ips =
     - 50 ips =
  reb force drop - 1st run to 2nd
   (varies, but here are 2 examples)
   [1840, 01 vs 04]            [1813, 24 vs 26]
     - 2ips = .94                 - 2ips = .93
     - 5ips = .93                 - 5ips = .96
     - 50 ips = .97              - 50 ips = .98