Mr. GC
I know you said no 1k talk, but heres a way you can run them safely and efficiently on your 100 amp service. Run two rooms on a flip, so you can run thou-wows, it essential for vert. But really I would move if I was renting, or install at least a 200 amp if I owned the home. That being said you could do pretty well running a 16k flip on 12 plants, 2 rooms of 8k and 6 plants each on alternating cycles, that way your only consuming 40 amps at a time with lights, and about fifty with ventilation equipment depending on how your cooling. You just cant run the oven and the dryer at the same time. This way you can be safe and still get a nice yield. Growing dank is frankly pretty easy these days with strong genetics and a basic knowledge of the plethora of high quality nutes. Its all about yield, at least it is to me. By growing vert with only 600's youve lost the race before its begun, although using 600's to supplement is a great idea, and by supplement i mean at least a2:1 ratio of 1k:600w, if not 3:1. I would also strongly stress flexibility in spacing, maximize your electicity dollars and get those bulbs as close as possible and expand as the plants get bigger.
