hi.
I don't run solo cups but I run some small single cola plants in 1liter containers. 6-8g per plant is possible but you need to have a lot of light. A lot of light takes some quality engineering to keep cool. I run a sort of modified and evolved style of drbudgreengenes style growing. If you want to do single cola sog with no veg you should definitely research his threads.
To get enough light you have to have enough wattage per area...depending on your light source you want X amount of watts per square foot. I was running led bulbs and getting great results with about 60w per square foot(1 gram per watt). I've since switched to COB leds and have lowered my wattage to about 28w while still increasing efficiency(1.6 grams per watt).
Cloning and keeping a mother plant is also key to running a smooth perpetual system. Clones flowered out at about 3" will end up finishing at about 12-16" high depending on strain..and yield about 5-9 grams depending on genetics, lighting and heath. This ends up yielding about 1.5 - 2oz per square foot. Until you get cloning down to a science and can produce new clones reliably on a schedule, you might want to consider supplementing with auto seeds. I don't recommend growing reg seeds 12/12 from the start. It can work, but you can get varied results...and waste a ton of time growing out males.
Feel free to browse through my micro thread in my sig as well. I have a ton of my grows cataloged and detailed.