my water is definitely 80 most of the time (end of summer here) and my cuttings were from some sativa's at week TEN!!!!!!!!!!!!!!!!!! of flowering. ten days on and roots spouting as a test after reading the 100 odd ungodly posts from icmag!
I have had 100% success of this always from tap water, no ph balance (tap water here is roughly 7.2PH), no clonex, no heater (unless winter) , haven't had totally blackened containers... rough as hell.
the number one rule we all learned as noobs...DONT OVER-MOTHER!!!! you seem to be doing everything right...far too right
photos to come from my ultra ghetto aeroponic cloner. its a beast that defies nature
but works!