Yellow & Claw (pics)

Hello all, take a look at these girls.

They are 4+ weeks into flower. hydro ebb and flow. 12 hours 400 watt HPS. Using pure blend pro bloom, liquid karma, sweet, big bud, cal mag, all at around 75-90%.

Anyway, several of the bottom leaves began turning yellow, and I'm getting a severe claw on the minor bud leaves.

I read the posts, and am now flushing them with pure water, will begin adding nuts tomorrow at 50%. Additionally, I cut off the severely yellow bottom leaves, I can't see how they are doing anything but sucking nuts from my sweet buds.

My only real issue is that I read claw means too much nuts, while yellow leaves look like not enough N. Not just a few yellow leaves, but probally 5 per plant.

Any advice would be appriciated.

What is your PH?

PH is around 5.5-6.5. I think it might have been the big bud I put in, didn't have an accurate way to measure. leaves turned within 1 week from last water / nut change. How long do you reccommend to flush? I have had it on pure water for 3 flood cycles now, and thinkig of adding 50% nutes tomorrow. Heres a few more pics

By the way.. from germ 7 plants two girls (crappy odds). Anyway thanks for your help. Looking forward to "smoking my own".

When I flush, I empty my res. and fill it back up with RO water and 2days later I empty the res. again and add my usual nutes.

Cool. I used drinking water purchased from the local grocery store (usually I just use tap water left in buckets for 24-48 hrs.).

Se cool and thanks for your all help.