Using EncFS in the Reverse mode (real clear text data and virtual encrypted equivalent) is very fragile with Syncthing. If you stop EncFS intentionally or unintentionally - or if Syncthing ever runs without EncFS running first - there is a big chance your data set will be erased.
I’ve decided it’s much more robust to run EncFS in the (normal) forward mode. This means you keep a hard copy of the encrypted data on an aggregator computer and let the clear text version be ethereal.
I’ve formally tested all the cases. If you want the details, message me.