http://www.foxfarmfertilizer.com/soilfeed.pdf
Here is alink to Foxfarms feeding schedule. You'll notice the dosage on here is not the same as whats on the back of the bottle. I follow this and not the bottle. No problems.
It really depends on how big of pots you use, and how big the plants are. I dont think it will do eight plants only having one gallon.
I mix up one gallon at a time, adjust the PH before hand of the water, add the grow big,check PH, and then add Big bloom.
The BB is so dark it messes up being able to check the PH after and it doesn't change the PH anyway, so add it last.
When mixing up flower nutes always adjust PH first, then add the TB, check PH to ensure it didnt change then add the BB.
I also use Gravity from humbolt county but you gotta be careful with that, and I add molasses the last two or three waterings of the flush to feed micro organisims.
Any more help...just ask!!