Questions about yumbolt and yield.

I was recently told that I should go for less plant and bigger plants to get a better yield so I went from 10-16 small plants in a 4x4 tent with a 400 watt hps and a 400 watt mh to soon to be 4 yumbolt clones that I am now vegging in 10 gal totes. I was thinking about doing a scrog but I am wondering if they are gonna be big enough to fill the canopy or would I be better off just letting them grow or fimming maybe. Maybe fimming then scrog I have not grown this strain yet but I am flowering one now. its only 3 weeks flowering but it stayed so small I am just afraid I aint gonna get shit. I dont buy from the black market so its important to get my usually yield. Any info appreciated.

Anybody grow much of this stuff.