In “The Stack”, change

If the total Size of Disks on a Stack ever exceeds its Capacity, that Stack has Overflowed; the Runner or Gridmaster whose action caused a Stack to Overflow must repeatedly Pop that Stack until it is empty.

to

If the total Size of Disks on a Stack ever exceeds its Capacity, that Stack has Overflowed; the Runner or Gridmaster whose action caused a Stack to Overflow must repeatedly Pop that Stack until it only contains one Disk, then reduce its capacity by 1, unless reducing the capacity this way would cause the Stack to be Overflowed.

If Special Case [Reinitialisation] is inactive, this proposal does nothing.