Shock? Horse hockey! Trans if you wish! Personally, I do my last up potting 10 days before they go to bloom. This is soil and organic, water only.
As a note, I generally "cut" my roots at the bottom of the pot by slicing in a cross shape, and re potting.....Old greenhouse trick.
Root bound? So simply feed the plant what it needs and the limited root space is basically meaningless! Increase the feedings and not the concentration of the feed solution. I feed synthetics run plants everyday at lights on. I feed just enough to get them to the next day, same time. These plants are run in 1 pot size smaller then organic plants.. Basically 2 and 3 gallon pots vs 5 and 7 gallon pots. Yields are just about the same but, the synthetic running plants need better support.