its normal.....let the clones do their thing!!! ure putting waayyy to much effort into this and chances are you will do more harm then good. i would dump the res and put straight tap water and no additives or ph and leave alone till you need to top off or see roots....then u ph water.
those little heaters are very inefficient(amp wise)... i would keep the heater on its own circuit. as for the lights you should be fine on one 15a outlet.
berry welcome to flood n drain world. i recently jumped on the wagon a month or 2 ago after growing in soil. and i can say i love F&D.
first off if your using rockwool it retains alot more water then say hydroton(what i use). so depending on size of plant you may be only flooding once or twice...
you should be fine. heat issues only come a problem when air movement is not adequate. but with the 19'' fan moving air around the closet you should be fine. you can also look into Co2 if you have the funds as IMO 30c is the perfect temp for a room with co2 injection.
if you can, cut away but leave much root mass possible to each plant.ive had the same prob. itll put em in shock for a week or so but the roots will grow back and the plants will recover as most of the main root structure is in the pots. n try not to cut any of the main roots. also run some kind...
so little update on grow. the 4x4 is 11 days in...and preflowers are showing.the bbs are up to the light already so ive started some minor training. all plants look very happy though..saw some deficiencys last week already so upped the ppms to 800 and will prob bring it up to 1000ppm next week...