2lb Fastbuds Autoflower challenge

start of week 8 Things are going well and seeing the buds develop and growing bigger with lots trichomes starting to coat the buds. one of the strawberry gorilla seems to be a week or so ahead of all other plants with the buds really bulking and coated in frosty trichomes and it smells amazing hps light removed from the grow after 1 week and the 2x 100w lumatek led strips put back and continued with added co2 into the tent lumatek zeus pro 600w is at a hanging Hight of 15inches running 100% power ac infinity has been keeping humidity between 52-58% and the temperature has been between 27-29 degrees Celsius the plants are drinking 1.75litres every 2days and plants are getting plain water every second feed Day 50 the plants were watered following my feeding schedule opened up the tent and it is now starting to smell good and the smell is getting stronger all the time PROBLEMS the 3plants in coco mix have been responding well with the sensi coco nutrients and i have notices growth again on them but continuing to keep a close eye on them the strawberry gorilla that seems to be slightly ahead of all other plants has some rust spots on a few leaves so will flush and feed following my feed schedule and add 1ml per litre of cal mag