outdoor autos guerilla way, advice needed

Hi everyone, i started this, because i would like some advices on the above topic. For two years i tried autos outdoors, next to my usual non-auto strains, but i must be fucking up something real, because they just stay stunted little plants with almost no yeald. The other strains are thriveing in the edact same enviroment. What did i do wrong? I try and share as much info as i can remember, how i done things.
So i germinated them as usual, planted the germinated seeds into soil, around the second half of april(my first suspicion is the lack of sunlight, or the reduced strength of early spring sun) they looked nice in the first two weeks, then the growth slowed, and stopped. They were around 20cm tall... some onyx males got bigger, but they had to go anyway. I was easy with the nutes, first week no nutes, second week wellwater with added nutes 1/8 th of the usual, and so on. The soil Ph was good, the water ph was good. I just donT understand. I tried around 15different strains, with the same poor result. I start to think i should stop, and stick with normal strains, as i did in the past years, but i really enjoy gardening, and this is like a new challange any help is appreciated. Thanks!

your soil is off .........they can only drawl in so much during the day and night unless u are feeding them they will stay small like that until u give them better dirt

http://www.ideal420soil.com/

that is premade super soil designed for weed ...........this stuff and just water u should pull half power out of the plant no trouble
other wise u need to look up Subcool's super soil and mix up a batch for the plants


see with autos the life is so short if u are not offereing them what they need when they need it they will always turn out small (sometimes this can happen even if u give them feed if the roots have not expanded in the ground to give it a good intake ) .........rem a auto is only about 70days where your photo does 60 to 70 days just in veggie until the light shifts