I too have started only using one pot right from seed to flower, To make things easier and well thats about it.

I have noticed that My plants didn't do as well. As before My PH still get out of wack. I think thats more my fault tho. I use Botanicare Pur Belnd which you add everytime you water, So there really isn't any flush time.

I am planning on changiong my watering regime to feed feed water... Or better yet feed feed flush...

I even Ph Up my water to like 7.5 and I still get a low run off. 6.0 this paticular strain Im growing now really couldn't handle that low PH like others I have grown. Shes got rust blotches all ove rher fan leaves/.

So next time around Im gonna switch to that water schedual, feed feed flush... And if that don't work im gonna do a transplant half way through the grow..

Sorry I can't help you much man.. thats just my experience. I really want to avoid transplanting... Its messy and a drag in an aprtment...

kd