Cloning Problems

Hi, I am having an issue with my cloning techniques. I am a pretty much an ameture please help.

Issue #1

I am only getting solid rooting on a small portion of my clones and it has been nearly 9 days. Most of the clones have 1 very small root or none at all.

Issue #2

I have yellowing leaves, almost looks like nutrient burn. I am using a very, very, very light nutrient solution using my medium of rock wool but my nodes are yellowing and stems are turning purplish brown.

Issue #3

I am using CFL, how much wattage/calvin/lumen factor should i have for approx 15 clones

FYI, using a cloning dome, botanicare rooting gel and the advanced nutrient mixture from the local hydro shop.

Make sure you pres oad your rockwool for 24 hours in 5.0 phed wter. Use the Humid-dome,a nd the gel. Also, your cudes should be moist, not saturated.