Hey, got some info for you. I found something today.......
Mycorrhiza you can read up on it here
http://en.wikipedia.org/wiki/Mycorrhiza
Now I'm not sure if roots still grow during flower, but if they do then you want to get some now. If not then you'll want to get some on your next grow.
In a nut shell, it helps your roots grow bigger and stronger faster, it helps roots absorb and process more of everything, and it even helps clones root faster. Definately a must have.
There are several products and brands that have it. Just get one with low nutes so you can add it to your regular watering schedule.
It's a lot cheaper at a Nursery ($13 a qt) than at a grow store ($40 a qt). You can mix it with the soil when you mix your pots, you can dig holes at the edge of your roots and burry some to feed established plants, and you can water with it. And it's also good for when you transplant.
No matter which technique you try, you'll want to add this to your plans. It will help all those colas get as big as possible. And I'm convinced that you'll need it if you want to build a monster like in the pic I posted on page 2.
I hope that helps some.