Well an auto that doesn't show sex in the first few weeks is a photo. Even a few generations down the line autos may still have a small chance of being photo, it's just a chance that you get bad genetics. The thing that keeps autos size so small is their lack of vegetative growth. Just being an "auto" doesn't make them small. I vegged for a little more than a month before I flipped to 12/12 so all intents and purposes my plants are photos. World of
seeds actually has very good reviews and has been around for awhile so I was surprised at it not being an auto. Blue Mammoth was released on 4/20 and barney's
seeds aren't always that great so I guess it's not fair to say they're still working out the kinks. Unless you're talking about Nirvana I'm not sure where you heard that a lot of autos have to be put on 12/12.
Also as far as autos being small it really depends on your grow. Check this thread out
Auto-Flower Bud Porn!!!
Bookmarks