Best thing you can do is look at diaries in 8x4 tents and gauge what looks good and what worked from these guys. If yields your concern - I’d go photoperiods. Autos are just inconsistent.. and less yield.. you’ll have some you chop at day 70 and some will go to day 110.
Go photoperiod - go 5 weeks in Veg. Then flip. Most will be done in 8-9 weeks after flip. That’s 100 days for better bud and more of it.
I’d put my yield at 4 pounds easily from an 8x4 with photoperiods. Autos.. won’t even try to guess