8 words solution: (ROT13)QVFVYYHFVBAVAT, HASHYSVYYRQ, RKGREANYVFRQ, NFFVFGF, EVGHNYVFGVPNYYL, YHKHEVNAG, PBAGVAHHZ, FBHGUJRFGJNEQF
after exhaustive computer search, turns out this is the best that can be done! the methods for getting the possibility space down were actually kinda interesting and I might explain them later
