Really thankful for the answer kratos015.
I'll tell you what i have right and now, and what my growing idea is so maybe you can give me some advice.
I start seeds in 28oz cups under CFLs.
Once transplanted to the final pot and put under the 400W inside the tent, i would like to veg for no more than 4 weeks before switching to 12/12.
I would also like to take care of no more than 4 plants.
Right now i have:
3 Belladona from Paradise Seeds in the cups; and another one from a breeder from my country, it's a indica dominant hybrid whit good branching on it's structure.
Available pots: 3x10gal fabric pots and 1x5gal fabric pot.
Last grow i did 6x4gal pots, and harvested around 7.5 ounces.
Plants were only topped, just a little training afterward with some ties in the pot itself.
I have no problem in putting a scrog net for future grows.
So...main idea is to have at least the same yield, with no more than 4 plants, with no more than 4 weeks of veg, in a scrog setup.
It's hard for me to imagine how to yield 7-8oz (i am not saying it's a great yield, but i want at least to stay on that numbers) with only 1 plant in 10gal pot, but mostly it's because of my lack of experience. Fortunately i'm getting better with each grow.
I don't have a lot of seeds available in my country, but if you can tell me about some strains, i will check what i have available here similar to those strains.
Tent is ~7ft tall, yes?
I recommend a stronger light. 7.5oz = 210g, which is roughly .53 GPW, so you're already a little above average. Many lights/ballasts are dimmable now. I've had success grabbing 1000w fixtures, and alternating between 750-1000w in a 4x4 tent.
Do you have legal limits that require you only grow a certain amount of plants?
If you only want to veg for 4 weeks, I would highly recommend going the SOG method and having 9 2-3 gallon pots in the 3x3 tent.
Good rule of thumb, one plant per square foot. 3x3= 9 sqft = 9 plants. Go with 9 plants in 1-3g pots in a SOG, if possible. From what I'm seeing though, Belladona is a sativa dom strain. So you should be able to take 2 Belladona plants in 10g pots and set up a nice SCROG with them.
Rather than tell you about some strains, I'd rather you mention what you have available to you and I can recommend you something from there.
For perspective, I'd yielded a little over 3oz from a 3g pot with Critical OG strain. One should be able to yield 8oz from a single 10g pot easily from a single plant, the caveat is that it would require more than 4 weeks veg time most likely.
This isn't me trying to brag, nor put you or anyone else down. Simply just trying to demonstrate the possibilities is all, and my possibilities are mediocre as fuck.
In your shoes, this is what I'd do. If Belladona exhibits sativa type growth, you should be able to get away with SCROGing 1-2 of those plants in a 3x3 tent.
You can totally pull over 8oz from a single 10g pot. I've pulled over 1lb from 10g pots plenty of times in my day, so I'm confident you can too. It will just take time, and experience.
Don't stress too much on yield my man. Just do your best, and continually strive to improving upon that even more. Letting fear cripple you will cripple you from trying new things, and learning.
I'd recommend a stronger light, if possible. I'm currently vegging plants in a 7ft tall 8x8 tent with a single 1000w DE light. Getting a light stronger than 400w fixture will likely help you tremendously. And grab a dimmable ballast if at all possible. My 1000w DE light is dimmable, I can run it at 600/750/1000/1100w depending on the setting.
I highly recommend getting a better light, because if you're already pulling .53GPW then the only things holding you back are either your soil, your light, or your strain, or any combination of the three.
The advice I stress to every and anyone is to stop being afraid to fuck up. You aren't growing commercially, you're growing for yourself. No need to be afraid to fuck up.
In fact, that .53GPW you grew was probably some of the best you've ever smoked. Was it not? Each and every grow is a learning experience friend.