Good info Stickee!!How much are yout taking off for clones? If your triming a four foot mother down to two main stems with a little afro on top i'd say you have gone too far. On the other hand if thats not your problem. Are you leaching for too long before you take clones? What abouy pests and airborne pathogens? All of these could be a factor in your problem. What about sterility and the proper equipment? A dirty blade can make a nasty infection. I hope this helps!
Peace,
StickeeGreens