... but yeah, I agree with PhatJay in that you should get those extra bulbs in there and try to get the canopy both as even as you can (either SCRoG or LST while vegging), and the lights as close as you can (2" to 4") with lotsa airflow...

And you can make up with closeness what you don't quite have in lumens

I'm doing the same thing in my livingroom garden, with 24,800 lumens (12 bulbs total, all spectræ represented), but I'm only trying to cover four plants in about 2.5 square feet (2' x 1.25'). Currently have bulbs around 4-5" from plants, but wanna get that closer as soon as I can get some decent little cheapie fans).

As soon as I can, I wanna get all Sunbl4st3r CFLs in there, because I could up the light to 30,000 or 40,000 lumens, and at a cost of 312 or 416 watts, respectively.

Gonna do individuSCRoG next there...