Aeroponic cloning help

Hi all. I purchased a 3 1/2 gallon aeroponic bucket cloner. I've got it 30 mins ON and 30 OFF (the best I can do with the timer I have). I bought 2" net pots filled 1/2 way with clay pellets to lessen the ammount of water to the stems. I'm using hormex at 1/4 strength to prop my roots.

The problem is: I get root formation at the clipped nodes, but nothing longer than 1/4" and then they just stop after a few days. i kept my last batch in there for 2 weeks and got NO GROWTH.

Any suggestions as to how to continue the root growth past the stopping point.

The water temp is anywhere from 68-75 degrees F. I have a heater, but don't know if I should use it...

Flouro light tubes about 4 inches from cuttings.

ANY help is greatly appreciated!

bump for the cause

I found cooler water works better, I use a 120 site ez clone. I have a timer that sprays my water on for 3 min off for 1 min, this keeps the pump from heating the water and lets everything dry a bit before being sprayed again. Since this change in 10 - 12 days my roots are 12in and touching the water.. With lots of folar spray with jump start. In my res I use jump start, clonex and a little hormex a little 3 part.. hahahaha Good luck..

saine, it sounds as if im right on with everything. maybe ill try a little bit of the clonex concentrate. and maybe a new timer...

thanks, ill be back to keep people posted