I do not agree that the procedure is expensive. The system has only ~700 orbitals, it is not much for a cluster and even for a good quad-core PC with enough disks. If the active space is not too large (say, 2-3 occupied and 2-3 virtual MOs), you may try. Unfortunately, I cannot see MOs in the attached output and cannot say, which MOs should be included in the active space.
Alternatively, you may increase MAXIT in the $CONTRL group to, say, 100 iterations. In this case, you'll face the instability problem a little bit later :)