looking pretty good bro , the only thing i can see it might be is over watering , leaves are healthy looking color , plant looks good, so droopy curling leaves are a sign of overwatering ,so back off just a little see if this helps .
wet weight ,cause if you are saying dry i will have to see that !!!! from all i have seen onyx and mi5 are there biggest plants but ive only seen 2 possibly 3 oz tops !!!
from my research on autos i think dr green thumb auto iranian is top s for outdoors followed by your ak 47 strains and crosses heres a link to check out dr green thumb
http://en.seedfinder.eu/strain-info/Iranian_Auto_Flower/Dr_Greenthumb/
( looking great K2 nice green color going into flowering great job , i also use jacks nutes all those canna specific nutes and there high price's are for (suckers looking to part with there hard earned cash !!!!)
K2 WHAT IS YOUR FEED AND WATER SCHEDULE WITH YOUR HEMPY GROW ?DO YOU FEED HEAVY...
good reason bro !! check out this study i have in my journal on dark period its a good read ..
https://www.rollitup.org/blogs/blog8528-dark-time-harvest-whats-really.html