1st- that's not enough light but usually 8 weeks is best. I used cfl too but had 2 125w at 9,000 lumens a piece + 2 45w warm white at 1200 lumens a piece and got so so results.
2nd- clone now you want to do it durring veg state but your ok.
3rd- supposed yes eating the flowers but that means keeping it a live a seperate from the girls personally I just kill them and use material for compost next grow.