Few weeks left

few weeks left however my leaves are showing some stress... any advice? Im on 400 watts HPS and 12/12 / 1000 ppm dyna gro / ph 5.8 Any Ideas?
wondering if I should do a straight flush for a week no nutes just ph 5.8 H2o ??
Some Clones doing well and ready to go into a few days veg before i try a top cola grow.

100% normal, dont worry, your plant is not stressed, it is doing what they start doing towards the end of flowering, sucking all the stored energy and nutes from the leaves and putting them into the buds. if they dont come off with a gentle tug leave them. I try to wait till almost all the fan leaves are gone b4 harvesting,. get ready to see your buds swell up ALOT, lol, its got 3-5 weeks left im guessing. it looks good.

Thank You .. for the response man you are right they dont come off easy and I'm gonna sit back and chill for a few more weeks. Thanks again.