At WalMart, MG soil was going to be my suggestion as well. The nutrients in it will give a little stretch, but should finish nicely. No nutrients for the first few weeks after the transplant, then start with quarter or half-doses of nutrients, and watch their reaction.

Usually, I wait till the 2nd week or so of flower to give my final transplant, but using MG I would transplant a couple of weeks prior to the transplant. Gives 'em a chance to burn-off some of the nutes before switching to the flower stage.

Burying the crown (top of the rootball, where rootball meets the stalk) at this stage can have very negative results. Best to keep soil at same level. (unless you are re-vegging the lady)

Branch removal can be done safely to within about two weeks of switching to 12/12, but I leave 'em alone. At this point, the less you stress them, the better they will fill-in. More stress equals more recovery time...And just prior to flowering, you'll want 'em stress-free.