Need some advice..what am i doing wrong??

OK i have 2 trays 4x6's with 1 600watt light above each tray. Each table has 27 plants on each. each table is only producing 11ounces each harvest. I am using the soil system, nutrients, ph level is good, humidity is good, temp is good. Whats the prob? should i do less plants per table that way more light gets through to each plant? move up to a 1000watt bulb per table? (ive heard you should remove all leaves and small branches below the center of the plant when moved into flowering table that way light is focused on the top half of the plant since that is what has best budding results)...please help

i would (palm tree) them, i do and i only grow 4-6 max under my 800 watt duel spectrum. try a few less, and in veg bend them around so there spred out and the branches are sideways so all the nodes are same hight horizontal growth instead of vertical,

fewer plants might grow way nice all spred out like some lazy bitches ...

So wat household items could I use to grow some really good indoor shit.