"What specific factors it that makes hydro get BIG so much quicker?"
-- In soil, the roots have to go to the food. In hydroponics, the food is constantly available directly to the roots. Oxygen also helps roots to absorb nutrients - in hydroponics, oxygen is easily supplied to the root zone; oxygen is not as abundant in soil.
"And what can i do to make my Outdoors more like this.. naturally..?"
-- You can prepare your grow area outdoors, before planting, by amending or even replacing the soil they will be growing in. Depending on the local soil, your amendment can be tailored to increase oxygen by increasing drainage (esp. in clay type soils) or to even trade-off oxygen availability in order to slow drainage (esp. in sandy type soils).
If you can visit your outdoor plants every couple of days to feed though, I've always wanted to

try making a modified hempy bucket out of a 5-gallon bucket or larger (with hydroton or lava rock) and burying it. instead of one hole 2" above the bottom - make holes all over the bucket except for the bottom 2"


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