Can't give advice since I'm a newbie, but what I did with one of my Autos...I transplanted around day 40 from sprout. It was already 3 weeks in flower...I went from 3 gallon to 5 gallon. I tried my best not to damage the roots and sprinkled mycorrhizae "white shark" all around. The plant didn't skip a beat. It actually took-off and corrected some deficiencies.