In case others are curious...

Every genetic step you take without the male contribution, the further you get from 'stable' genetics. But yes, you can fem a femmed female in an emergency. I wouldn't trust the genetics if repeated past that, and would keep a close eye on the femmed fems through entire flowering process.

How many times have the femmed seeds been femmed, before you get them? If from a seed breeding house, likely not an issue. If from backyard stock, (a backyard breeder with bagseed stock, selling 'em at a seed auction site as top dollar genetics) watch 'em closely.

Personally, I think the seed breeders got it backwards. They should have offered femmed genetics at the regular price, and make the consumer pay extra for the privelage of buying the 'natural' seeds containing a 'normal' mix of M/F ratios.