Yes I vegged those girls for like 10 weeks, shorter veg time will get you shorter plants, though I’d veg for a minimum of 6 weeks to get decent yields.
On pots, I usually go from solo cup to 3 gal plastic pot to 7 gal fabric. For smaller plants you could go with solo cup to 2 gal plastic pot to 5 gal fabric pot. I love transplanting, nothing to be afraid of or avoid.
I have 2 Gorilla tents, both 3x3x7. On one tent that I use mostly for flowering I have an infinity T6 on top of the tent, not inside the tent, but with a carbon filter inside the tent above the lights. On my other tent that I use mostly for veg, I have a T6 inside the tent above the lights with no carbon filter.
I use the screens to support the branches\colas so they don’t fall over from being so top heavy. Would need to tie them up otherwise, I see the screen as the easier way, put it up once and done.
Check out my journal where I detail my growing methods and feel free to reach out with more questions.