I guess a S1 can be close to the mother especially if it's a "homozygote" (aa) plant. If a mom is heterozygote (ab) and you self it, it's less consistent. In that case I'd be rather pursuing a backcross with a phenotypical distinct male with rather recessive traits. But I am not a breeder....don't know what to tell you , I've found the opposite, and closest to a clone easier with the S1 ive run, not saying every pheno is identical but to me was easier to find with 5 Feminized seeds instead of any hybrid with another strain/phenotype.