That’s the problem. Turn compression back on, and then zfs send | zfs receive to adopt that for the existing files (follow node migration guide, adapted for zfs, and then you can rename the dataset back to the original name in the last step)
Generally keep settings at default, unless you have a very good reason to change them. Compression is on by default.
You can check the (hopefully, left at default) record size with zfs get recordsize pool1/storagenode. If you dont’ have compression enabled, you are wasting massive amount of storage, as most of storj files are very small.