Space Doubler seems to have an 8k overhead per packed app compared to scompress
TriplePOP = 121k scompress, 128k spacedoubler
HantroCP = 98k scompress, 106k spacedoubler
spacedoubler prob needs this as a header on the packed app to tell it how to decompress
However, the size of the spacedoubler app is 37k, compared to 84k of scompress.
V happy here