To complete the iron condor, I sold the RUT Nov 750/760 call spread, collecting $1.25.
The resulting iron condor is: RUT Nov 620/630 put; 750/760 call.
Running net credit: $4.05
I would have preferred not to sell calls with a 750 strike, but it was either sell that spread or collect a very low premium with higher strikes. This trade fits within my comfort zone, but barely.