thats insane man, my biggest ID is 10 inches tall and about 10 inches accross. Its like a bonsai version of yours. I wonder why there is such a giant diference in height given the age is about the same. maybe it the lighting and conditions I am using an LED and CFL combo with the CFLs never more than 3 inches from the plants and the LED about 8-10 inches above the top of the canopy, so far I have seen very little stretch durring bloom, only about 30%. the total wattage in the unit is 458 and there is about 114 watts per plant. this is significantly less than your lights but the distance is far far less, maybe this is part of it. Im really glad my ID stayed small though, a 3.5ft tall bush would fill my unit by itself. but its really interesting to see the same strain at 10 inches and then at 3.5 ft at the same stage of growth and both looking like very nice specimens.