i never feed during lights off. not much reason/advantage to doing so imo and can increase chances of root rot. not saying it is wrong, just not something i have found a reason for doing. 4 flood cycles 3 hours apart and the floods last 30 minutes (just because the trays werent quite full after 15 minutes and timers are 15 increments). in veg i give em 3 hours between floods but there are 2 more floods since day is 20 hours not 12
i bought a fancy aero cloner and had pretty crap results with it. taking 2 weeks to see signs of roots and only gettiing a few roots per clones.... very frustrating. i think my main mistake was not using a sterilizing product in the rez.
anywho, i got a couple trays of the rapid rooters and am having amazing results after ten days. heating mat under the tray and always keeping extra water in the tray so they dont dry out. very pleased with this method.
i dont like rockwool at all. either too wet or not moist enough. could never seem to get things to grow well in it. meanwhiile, i see plenty of growers use it with very high success rates
temps that low will for sure slow/prevent root formation. gotta get the water temp up in low to mid 70s. are you using any products or just straight water?