New HYDRO grower... in first week of flower... QUESTIONS

What's good RIUppers.

So I'm a newbie Hydro grower - DIY setup - closet tent grow.
Here's a sample:
IMG_20120629_100940.jpg
If you look closely you can see I've been tying them down, some more than others. One of the plants is an Aurora and the other 3 are master kush. The aurora grows faster and longer, so she's been tied down significantly. If you droopy stems it's not the plant, it's from me tying then down a few minutes ago.

These ladies have gone on a crazy growth spurt the past 6 days. Ever since I switched to 12/12 they are booming.

So the questions:
1. Will this vertical growth slow down soon? If not, I may run out of space and that would be a major bummer for me. If I have to harvest early that would suck considering the the immense time, effort, and $$$$ I put into this grow.

2. Is there any way to slow down the vertical growth without adding more nutes to the soup? I have invested lots of $$ in GH Bloom/Micro - Cal-Mag - Bud Candy - Bid Bud - Overdrive - FloraKleen and do not want to add anything else. As it stands I'm still working out the flowering schedule with the AN Nutes. Even though I've already started on 12/12, can a 24 or 36 hour dark period slow the vertical and force the flower more, or will this unnecessarily stress out the girls?

Thanks a lot for any responses. Much appreciated.
 
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