hey buddy. i got nearly the exact setup, try to do it all at once.. veg in dome a little longer... get plants till about 16" once they outgrow the dome under ur flor. lights before u strip bottom two nodes, using a steel ring cage (has three tiers) u can spread ur plants to have a better canopy and fill ur grow tent with maxing ur 4 by 8 space. veg till they just reach the third tier and go ahead and make ur switch to 12/12. u want a 18"-24" distance from top node to hood glass. during ur cloning i suggest as well instead of rapid rooter (which i have used and had terrible results) use macros and then rockwool cubes. much better for overall root development throughout grow.(drains better) use perlite for a better drainage. if u dont mind work try a scrog (its how i put out 1.7 per watt, also depends on strain.) also if i may suggest a expensive but well worth the cost in root development is root excelurator. the more nodes the more canopy, the more light covered, the more roots the more yield. i really admire ur setup. and about heat my little secret for getting lights nearly 16" on recirculating air is the icebox with a chiller. u can setup multiple iceboxs off one chiller. my air output in 70 degrees and i use less co2 cause it recirculates.