How is your yellow leaf problem going along masterg?

Here are updated pics from today. I decided to start LST yesterday to keep an even canopy for the CFL's. They are doing SO MUCH BETTER NOW than before, it's almost amazing how much of a beatdown they can take.

I plan on flowering Oct 6 to harvest around Dec 6 + curing = homegrown buds right after my last final of my last semester of undergraduate college. Booyakasha.

Question though...

The plants are 4-5 weeks old in 4" pots and want to transplant to 3 gal pots. Should I transplant before I flower... how much in advance?