top leaves drooping bad! Help!

I try and try again but there is always something!

I am currently flowering berry auto ryder, one of the autoflowering strains and they just wont stay happy, every now and then i get this really bad droop for a few days. They were watered 12 hrs ago and the top 3 nodes look miserable! I dont think i over watered but maybe i did? soil seemed to be dry 2" down or so. they are currently flowering under a 600w air cooled hps, and am using advanced nutrients sensi bloom ph perfect with the hobbiest bundle. PH stays around 6.2 and the ppms at feeding average 600ppm or so. I have had this issue once before but it mysteriously whent away. I was also wondering if it could be the portable ac i hooked up recently to keep them cooler, temps are good stay mid 70s or so with humidity around 30% but they look awful. The ac does have an aggressive blower fan and I can see movement through out the leaves but I dont think its any more aggressive then the fans I had before the AC. Any thoughts?
 

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