how long after discovering a successful germination are you waiting to put them in the soil? and what kind of soil are you using? u could be using some soil with enough extra ferts to burn the rootlings to almighty hell lol

did you check the rundown ph? how long are the roots at first when you stuck'm in the dirt?

i use the paper towel method all the time, works like a charm for me.. make sure ur not adding too much water.. and try starting them out in something organic