what do you think folks 4 weeks to go

What kind of problems do you mean I want to be aware, as far as I know coco is fungisidal (so no kind of bad stuff can live in it), I reuse coco. At the moment I grow 10 starins in 1.6 liter containers and ofcourse feeding is the almost same for everyone. I use coco bricks flushed in the pillow case. One brick gives 4 liters and costs 1 USD, also you need 3 times less volume of coco than soil, so your excuse about expensivness is not accepted:)
The only major disadvantage in coco is elongated veg stage due to the root mass growing, but payed off by harvest. I suggest you to maintain a couple of girls in coco along with your soil grow and make an experiment.
:)