I also dont top mine, I just bend them over, and they grow into a huge round bush. Ivee done a best of 22oz from one plant in a 4 x 4, with a 1000w Hortilux HPS. Vegged from clone for 60 days, and 20 gallons of soil.
I start them in 32oz Uline Deli Containers, transplant them into 5 gallon containers for veg, and then transplant them again into a 20 gallon container for flowering. Im runnin a 1000w Hortilux, a 1150w gavita DE, and a DE 1000w CMH for my flowering lights. I veg with both a 1000w Hortilux, and a 645w Gavita 1700e. I mainly veg in the 5 gallons containers because I can deal with them easier than I can 20 gallon containers, and I can get more plants under the lights with 5 gallon containers. I can get 6-7 plants in 20 gallon containers under th 3 lights, and I can squeeze 5 more around the perimiter using 5 gallon containers. I can get about 85oz every 63 days like this. About a week short of 6 harvests a year if every thing goes right.
I also have an old Barneys Farm G13 x Haze cut from 2009 that grows, and produces similar results. It stinks more than the SSH, but the new BF G13 x Haze isnt the same.
By comparison I have a 2004 cut of AK47, and it will produce at best 14oz using the same method, but is 2x stronger than either the SSH, and Barneys gear. I prefer the AK47 by a great deal, but I like the production of the the other 2. The AK47 also reeks a huge amount more. If youve got an oz in the car, and the wind is blowing right, you can smell it a 100 feet away. I also have a cross of the AK47, and pre 2000 NL5 that also reeks similarly, and potency wise. The pure AK47 has an Anise Seed, and hash flavor, and reeks of cat piss, and the cross tastes like flowers, and hash, and smells like cat piss and flowers.
SSH is one of the best producers Ive found.
My SSH also has really good internode spacing, and isnt lanky. I keep the 1000w Hortilux about 20 inhes from the canopy, 24 inches for seedlings, and 38-40 inches for the DE Gavita, and 38 inches for the DE CMH. The Gavita can get very hot, and throws out a huge amount of Infrared.
I also use 2x Solacure Flower Power UVA/UVB bulbs per 4 ft area, and I also use them in veg. They run 4-6 hours under the Hortilux, and 8 hours uner the CMH, and DE Gavita because those 2 lights have to be run further away.
Also if you have a plant that stretches alot, and have a low ceiling, simply veg it less. IMHO a plant that stretches alot in flower cuts down on veg time.
Ive also got a cut of 2006 Willie Nelson. Its a 100 day flower, and it will stretch 7=8 times its size at flowering. Its a huge producer, on par, if not better than the SSH, or G13 x Haze. I usually start it on 12/12because it gets so huge. Its not feasable outside whre I live though. Its not done until mid November outside. Id say it would get 15 feet tall outside, and 10 feet wide.
I got the best Ive ever done from it out of a 5 gallon container. It produced 16oz in a 5 gallon container. It will stretch for 80 days if vegged on 24/0 for a month, and use the last 20 days finishing out. It for sure has to be bent over, and will take up space under 2 1000w Hortilux lights vs 1 light.
By omparison the best Ive done with the SSH in a 5 gallon container is 7oz. The same size plant as wahts in the 5 gallon container that produces a best of 7oz, when transplanted into 20g for flowering will do 18-22oz. The Willie Nelson isnt as picky about container size. Also the stretch in the 5 gallon container is about 2x vs 6 times in the 20 gallon. The smaller container greatly affects the SSH, and G13/Haze stretch.