No one has ever gotten them to root the way you are going about it.
- Get them out of water
- Strike the cuttings in a suitable size nursery container partly filled with your dampened favorite bonsai substrate
- do it in a way that the cutting is secure and won't move around if the pot is moved
- Enclose in translucent plastic (so as to make a terrarium or humidity tent
- Place in a shaded spot (no direct sunlight)
Optionally you can sit it on a heating pad set to maintain 70F-75F.
If you see possible fungal issues, spray the cutting and inside of the 'tent' with a solution of 2 tablespoons 3% hydrogen peroxide to one quart of water and re-enclose. If you have the peroxide on hand you might do this when you first put the cutting into the 'tent'