Ahhhh I see, said the blind carpenter as he picked up his hammer and saw.
You've got bubble buckets. Phew. Good!
2 gallon bubble buckets are still not going to allow a ton of veg time; have you considered a larger bucket size, or bubbletubs that have ~ 6 sites apiece?
Plan to space your clones to be flowered at about 6-12"- 6 with no veg time and 12 with 2 weeks or so. That's a matter of math then; measure the room and see what you come up with.

Yield in a properly set up system is going to approximate .5 grams per watt of HID (flouros aren't the same; dont count them) during flower per month the plant spends in flower. A properly set up sysatem maintains a continuous canopy as much as possible.