your goin to have to give up traditional methods youve read about and take another aproach that way of cloning has minimal success and is hard.
A batch of clones in rockwool
ive been following this for 3 cuttings now and i started the way you did with about a 25% success rate and the last batch i had 20/24 thats about 84% and im gettin better and with leaps and bounds, trust me this is the way to do it.