Swelling tricks is used by the greedy dealer, to make it look like there's more, Chinese people do it when there selling melons by the river, they put holes in there melons and float them in the river to swell up,,,,,,don't try this with your weed!!
the river may be full of cantaminates??
and itll get wet??
I have not tried autoflower before. However, what I read is make sure your pot is oversized (it seems you have done that) for root growth. Continue giving her p and k and a little n,plus molasses. The boiled bananna peel for k and molasses for the biology is excellent. The most important thing is give her time. It appears she is doing the thing