I hoped that by normalizing each row by it's L2-norm, this wouldn't be necessary, since it should put all meaningful values in the vicinity of 1. But I think it would probably be rather close. For my SSS and non-SSS file, the max singular values are 15 (8) and 10 (8) for pre-SSP (and post-SSP). If you think it would be more robust, I'm fine doing it relative to the max, though...