New Grower best methods for trimming/training autos for yeild

[UK-gorilla]

Hi, im in the middle of a outdoor grow in the woods, wondering the best way to increase the yeild of my Magnum Autos.
should i Top them or FIM or just bend and tie them down to get the highest yeild.
At the moment i have 10 that are in flower, i just let nature do its thing and now im left 3ft high plants with a stupidly thick center stalk but not many branches or bud sites.. i don't want my next ones to end up the same.
they may seem bushy but thats because i have 2x plants per 5 galon pot, i bent them out away from each other as much as possible

 

[namvet25]

You shouldn't put two plants in one pot especially large strains.How many hours of full sunlight does it get.That long distance between nodes usually is a sign of not enough sunlight.

 

[UK-gorilla]

they only went in pairs due to a lack of pots and soil on the transplant day. i had some issues at the start of the grow so they stayed in tiney pots for over a month and were all 4inches high with signs of flowering . i didnt expect them to get so big the next ones are all in their own plants.
Direct sunlight id say atleast 6 hours a day. some of the larger ones may be getting shadowed though so il move them more into the centre of the spot