Yellow leaves spreading...

Hi everyone,
My plants are tuning yellow from the bottom up, my ph has been 6.2 my ppm 750, temps been 26/28 day and 21/22 at night. I have no salt build up, plants are drinking well.
But the yellowing is spreading, not anywhere near to the bud sites, but I'm starting to worry. I feel like I'm doing everything by the book, so I don't know if it's normal at 6weeks 2days, or not? The buds are changing rapidly, starting to go into a sort of xmas tree shape, and it's getting brown hairs. Also I've just ordered FloraKleen and Ripen, my plan was to start pk13/14 yesterday which I did but I only used 0.5mls per litre. I heard it's strong stuff. So I was going to do that for a week with the PK and then flush with the FloraKleen, then use the ripen for 2 weeks and then final flush with FloraKleen so that makes it to 10 weeks after everything has been done. Does that sound okay or not. As it's my first grow, I'm starting to panic because of the yellowing, I don't want to let the sugar leaves turn yellow. Has anyone used ripen?
Any info much appreciated
 

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