I don't get it. Why not just plant in the bed? Or, if you're leaving them in the bags, why not just spread then out when they get crowded?
I will say that, last year, I had my 8'x4' beds planted out in three rows of six plants, just like what you got going. They all grew well, and yeah, it got really crowded. What I noticed was that the plant in the center row never produced nearly as many pods. I don't know the science behind it, but my theory is that the center row got kinda lost under the canopy, and they either flowered less of the flowers were less likely to pollinate due to either a lack of airflow, a lack of sunlight, or less accessed to pollinating critters(?)... Maybe a combo of two of all of those factors. Or it might be something else...
At any rate, because of that lackluster result from my central rows, this year I'm just planting two rows of six, for a total of twelve plants, in the same beds. I have to confess, in a little worried about wind causing more damage bc the plants used to lean on eachother, but I'll see how they do.
Good luck with your grow!