Okay basically some games are not working yet smoothly ... is this noted to be fix in future updates of ti foil or goldleaf?You can use cfw on 7.0.x just fine, look into tinfoil and gold leaf USB install, I managed to get Xenoblade 2 and all its dlcs to install on 7.0.1, just that games installation isn't all smoothly on 7.0.x.
Probably was that you updated via ota, so it burn your fuse, that how Nintendo prevents downgrades in general in term of concept.