autoflowering plants do not respond to changes in light or environment. instead their life cycle is on a timer that is started right when your seed sprouts. if you take a cutting you cannot put it back into veg because the timer is already counting. does this make sense? normal cuttings that are taken, even in flower, can be reverted back into veg cycle because they do not have this timing based life cycle. i would say that if the cutting did take root it would be immediately flowering nomatter what you try.
good luck man, interested to see how this plays out
cheers!
edit: the reason for the random growth is because it is still flowering. equal growth as you know is only in veg cycle