I thought of that. The SB50 as a GN of 72 at ISO 100 and the SB80 of 125 at ISO 100. I have been shooting a variety of 400 speed print films so the effective GN should be a bit higher. I know that I can light a subject at 50+ feet with the SB50 when shooting straight but have never tested the limits of the SB80 (although I have shot well over 50 feet).
The typical light path from flash to subject for my bounces is about 10-20 feet. I have a hard time believing that I couldn't bounce either one of the flashes at that distance. I figure I must be doing something else wrong.