Hi! What problems are you having with the coco coir you have used and how habe you treated it? Some agricultural coir has trichoderma (green mold) added to it because it apparently promotes root growth and such.
Bio Nova brand coir has been working fine, although I don't know if it has trich too. Anyhow, thorough pasteurization should get rid of the possibly added fungi.
PS. I moved your thread to a more suitable area.