I wouldn't be reusing FFOF. As I understand it, when planting in FFOF (this is the soil I'm using, too, for my first grow), if I'm not mistaken, as your plants are growing, they're leeching all the nutrients out of that soil. So, if you recycle it, you're going to have to start giving your ladies nutes really early as the soil will no longer have the nutrients your plants need, leaving you with the need to either transplant into fresh soil or nute your girls earlier than usual.
I'd use fresh soil, unless you're amending/composting what you're recycling.
-nasty