I do apologise dampille, but I disagree. Transplanting does not cause as much stress as you would believe, especially in early flower while there is still root production; I alloted for this transplant specifically at 2 week flower. And "a rule of thumb for 1 gallon of soil for every foot of plant?" I disagree again, the plants root structure is very dependant on its canopy, the canopy (measured from the edges of the widest splitting stems, not the leaves) can grow no larger than the breadth of it's root structure; and height is defined by the amount of light vs. temperature diferentiation from day to night (little light with a large temperature swing makes for a large internodal gap, ample light with a small temperature swing makes for a small internodal gap). The pot that provides the most "control" is the pot that offers the appropriate amount of space for the roots vs. areated soil, if I leave these in the 8" pots the contents will turn into a solid spongy block from being over-root bound. One last thing, get yourself a pH probe pen that tests the water directly and check the run-off to check the soil's pH, soil probes are NOT accurate.

JSG.