3rd grow...need lighting advice, please n ty

Hi everybody! Hope this is the right forum to post this...
I'm on a my third grow about ready to switch to 12/12. I've been vegging 16 Tropical Kush plants under a 600W conversion and a 400W mh for a month in my veg bathroom. They are in 6" rw cubes. I hand water them with Floranova grow and Floralacious Plus. They're healthy and I haven't had any problems, unlike my first two grows. They are all about two feet tall.

In my flower room I have a 4X8 ebb n' flow tray under 2-1000W hps, air-cooled lights. My friend loaned me 4-600W hps lites and now I'm trying to figure out how I should set up my 16 ladies. I was thinkin maybe buying another 4X8 table and putting 8 plants on each, placing 1-1000W(in the middle) and 2-600s(on the ends) over each table? Or should I just put all 16 on one table with 1-600W(middle) and 2-1000W(ends)? Which way might produce a higher yield?

My first two grows were pretty mediocre. On my first First grow I had 12 Haze plants and 2 green cracks all in 4" and 6" rw cubes, on my 4X8 ebb n flow with 2-1000W hps lites and I averaged 1.5oz/haze and 3oz/green cracks, 1.5 lbs total. My second grow(still drying/curing) I had 10 green cracks and 3 faceoffs(?) in 6" rw cubes and it looks like I'm probably gonna get about the same as the first time. I appreciate any incite. Thanks.
 
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