Alrite lad long time no see, wouldn't mind seeing some pics, is that fast bud budding at all? only coz autos have a really strict life cycle so if you switched it to 12/12 and it wasn't getting maximum light like it should off ,it will get to its a ripe age bout 9 weeks and if still really underdeveloped will begin to die off before it finishes up budding, Autos like i said have a strict life cycle and will begin flowering once they reach a certain age wether or not it is as fully grown as it shuold of been by then, so in theory if it is really lagging behind on budding and it is already past the 8 week mark, its life cycle is over and it will begin dieing of as it should of reproduced by then, if you know what i mean? This is why you should always give them maximun light all through the grow, as you want it as fully devolped as it can be when flowering automatucally kicks in. Obviously keep holding out and see what happens but all im saying i wouldnt hold my breath if it is still really underdevolped at that age, as in no bud stucture at all just randoms buds of white hair, if they have already formed colas tho they should be fine to finish up nicely. Will have to see pics tho. Sorry to ramble lad just thought id give you my opinion as to why growth has slowed if not stopped. Nice1