alright I have 2 suggestions as I'm fairly new to cloning.

1. Apply the gel directly to the stem of the clone, do not just put it in the hole of the rapid rooters.

2. I suggest making a aeroponic cloner. I just built 1 for about $45. I use 5mL of Clonex per gal of water. I kept the cloner under my 400w MH at about 18-24 inches. I had 100% rate of rooting although it took me about 2 1/2 weeks to get them to root.

These are just suggestions. MJ seems pretty easy to get to root, just follow the instructions on whatever cloning gel/solution you use. I believe most of your trouble probably comes from not directly applying your gel to the plants. I am a true believer in the homemade aero cloners that are out there (they worked for me):thumbsup::thumbsup: