It looks to me like you have 4 - 2 gal bags under a 2 ft square screen, with the screen filled to 50%. So what are you waiting for, flip it now. With the size of your screen 2 plants would have filled it up.
Flip now and your next 2 wks will be busy keeping these girls spread out.
Example: 4 plants under a 3ft sq screen at 6 wks (your screen 4 sq ft, this one 9 sq ft)
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You could pull off another wk of veg if you are using 250w HID or more, if florescent flip now.