I've tried a few rooting media...and I'm never going back from coconut coir. From my 14 UC Davis cuttings (28 after breaking in half), 100% of them rooted. Go to a pet store and pick up a brick of coir, wet it, but not soaking...it will take some time to break it up with your hands....your fingers will hurt when you're done...but it will be worth it.
Oh, and I didn't have any mold. I did dunk my non-tip cuttings in 10% bleach for a few seconds though...that probably helped