Advise, rate and critique a complete newbies 5x5 tent setup

Hello everyone, this will be my first try at growing and I'm looking for advice or feedback on my setup. I will be growing in soil.

Currently everything is on order and I will have the following:
Equipment
1 x Secret Jardin Dark Street II 5ft x 5ft x 6.6ft Tall (DS150II)
1 x 6" Cooltube XL Reflector w/ add-on 26" x 25" Extra Large Wing
1 x 600 watt iPower Digital Dimmable Ballast
1 x 600 watt iPower Hortilife Super High Pressure Sodium Bulb (85,000 Lumen @ 2100k color temp)
1 x 600 watt iPower Hortilife Metal Halide Bulb (55,000 Lumen @ 6500k color temp)
1 x 6" High Output In Line Duct Fan 435 CFM (for carbon filter)
1 x 6”x24” Funk Filter Carbon Air Filter
2 x 6” Booster In-Line Duct Fan (250CFM each) (one for cooltube and one as fresh air intake for the tent)
1 x Speed Bully Motor Speed Controller

Soil/Chems/Nutrients
- Pro-Mix Vegetable & Herb Organic Soil Mix (click me)
- CIL Plus! Worm Casting Compost (click me)
- MyGreenPlanet Hydro Fuel Grow A/B (click me)
- MyGreenPlanet Hydro Fuel Bloom A/B (click me)
- MyGreenPlanet Pro Cal (cal, mag, iron supplement) (1.1-0-0) (click me)
- MyGreenPlanet Massive Bloom Formulation (1-1.5-2. (click me)
- MyGreenPlanet Terpinator (0-0-4) (click me)
- MyGreenPlanet Finisher (0.0083-0.011-0.0505) (click me)
- Zero Tolerance 1 Qt. RTU Herbal Pesticide (Not sure if needed, ordered as contingency plan)
- Zero Tolerance 1 Qt. RTU Herbal Fungicide (Not sure if needed, ordered as contingency plan)

I have 10 purple kush seeds and I was thinking of doing 6 plants for my 5x5. Not sure if that is enough or too little. I plan to start their flowering once they reach about 3 feet and I plan on using bamboo shoots or tomato cages as support. I will be using the 6500k MH lamp during veg and switch to the 2100k lamp on flower. I also have two additional 4ft T8x3 bulb fixtures with reflectors I plan on hanging on each side of the main lamp for additional lighting in the same or different spectrums. Each fluorescent tube puts out 2750 lumens and 6 of them will = 16,500 extra lumens for each growing stage. My 600 watt MH lamp only puts out 55,000 lumen so I was thinking of putting 6 x 6500k 48" fluorescent tubes to aid with more light OR I could put 4 lamps at 3000k and 2 lamps at 6500k.

During flowering I was thinking of having all 6 tubes(16,500 lumen) with 6500k light in addition to the 600watt HPS(85,000 lumen) at 2100k to give a more full color spectrum to the plants during flower.

One last thing...how big should my buckets be for 3ft plants? Are 5 gallon pails to big or can I work with a shallower 4 gallon container? I need to keep my HID light about 18-20" above my plants and I only have 6.5 feet of height to work with. 5 gallon bucket is 1.5ft plant is 3ft and clearance is another 1.5-1.75ft leaving me with very little wiggle room if I wish to go taller unless I low stress train them to fan out or something.

This is all I have time to type out right now but I will be back with more questions and details. I'm super excited and anxious to start! Any input is appreciated, Thanks!

If height is an issue I'd suggest a veg time around a month or so. But remember every additional 10 days of veg has the potential to double your yield. I think to maximize yield and to utilize all your lighting efficiently I would veg and let for a month or two.

Lst* low stress training. Is what I meant haha

You can do 9 in 3 gallon grow bags in a 5x5 room. Grow in 6" pot first till about 14 inches tall then put in bags. Hit with heavy rooting agent, Rhizo from Canna, for the next week to ten days then top and clean up. Let go another week or so and then flip. Keep heavy rooting agents till a week into bud. Then reduce for a few more weeks then stop in last 3 weeks of bud. I see no rooting agent or silicon in your list. Add silicon too. Put silicon in water first and stir. Then add rest of your nutes.
I would have used a 1000 watt light, but heat is always a concern.