Nutrient Loss from plants....please help

hey everybody... my girls are acting funny and not sure if this is normal or not so i would appreciate your input. This is my first grow so i'm not sure what to expect here towards the end.

My setup:
-400W sodium in air cooled reflector
-homemade bubbleponic 27 gallon reservoir w pump for misters filled to 6 gallons
-inside 2'x3'x6'H cab.
-reservoir temp. high(day) 78 F Low(night) 72 F
-int. cab temp. high(day) 88 F low(night) 68 F
-two girls -unknown cali. seeds, indica looking with strong citrus smell on buds
-into 6th week of flowering, 1/3-1/2 of buds have changed to brown pistils
-using technaflora starter kit at 1/2 strength followed exact recommendations, keep PH at 5.8

The problem is...for the last 2-3 wks, I flush, add fresh nutes at 1/2 strength, record EC and PPM and then everyday after these levels creep up. I also noticed the leaves are changing to lighter green and lower leaves are yellowing. They look similiar to N deficiency. I know my temps are too high but I am having a hard time keeping temps down.

Is it normal towards the end of flowering that the plants are putting out nutrients or is it the temperature problems i'm having with the cab. and res. that is causing the outflow of nutrients or is it the nutrients?

thanks for your input
 
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