my advise is to start out easy with the nutes. maybe go 1/4 strength and slowly add more to see what your strains can handle. many first time growers have a problem of over fertilizing.
Try to keep the plant canopy even. because your growing several different strains, i would recommend putting the short growing ones in the middle and the taller ones on the outside. If ones in the middle start getting taller, then move them to the outside. I would recommend later using one strain if your looking for yield.
Also What reflector are you using? there is a link in my sig that has light spread charts for some reflectors. These charts will tell you the optimal distances to set your reflector away from your plants. 600w lights will generally cover a 4' x 4' perimeter optimally.
space out your plants as much as possible. prolly a 3 x 3 pattern 18" apart. I would grow them 3 feet tall, so flower them at about 18". I would trim the bottom of the plants where the grow is slow just before the plants start to bud. bout 6" or so.
Make sure you are bringing fresh air in the room. The more fresh air or co2 the better as long as your temps and humidity levels are appropriate.
if possible keep your night temperatures 10-15 degrees below your daytime temps. this has shown to improve growth rates and is called thermoperiocity. What happens is some of the energy that is stored from photosynthesis is used during respiration at night. The lower the temperature is at night the lower the respiration rate is, so less energy is wasted and, therefore, can be used for growth instead. if you use a fan to control temps this controller does the job.
https://rasahydroponics.com/day-night-variable-fan-speed-controller
