Look dude, i didnt want to read the whole thread, so maybe im repeating stuff others may have suggested, but i wanted to give you my 2 cents. Im not the best cloner by any means, but i usually have a 90%+ success rate. I cannot do rockwool, i couldnt get much success at all from it, so id suggest not messing with it. I like using either jiffy pellets or this other foamlike stuff, cant think of the name. Keep your florecent a good ammount away from the clones, the heat and light intensity can be bad for em. I have found that when i used a t5 it was too intense for em, so i use a regular blue florecent bulb now and it works good for me. Id suggest keeping the lights on 24 hours while cloning, and get rid of the mylar. Make sure you are keeping a dome on, but i keep some holes in the dome for fresh air to get in a tad. Mist them frequently the first few days. I dont even bother with a heat mat. Send me private messages if you need any help.
o ya, one other good trick is to spilt the stem a bit after u cut. It opens up the stem to form more roots. Hope thats not too confusing.