For me:
Although I use Flora Series (Grow, Micro, Bloom, [Kool Bloom, Floralicous Plus, Flora Nectar <-- Flower Only] [Superthrive and Zone <-- Veg only]
Generally I follow their guide for Recirculating Aero.
I use Gro all the way up to Week 3-4 (Depending on strain and flower time). After that I cut Grow completely.
But in reference to the clawing... I have no idea what that means. I left for a weekend once and didn't top off my rez, got home and the rez was empty. Some of the leaves started clawing down and have not recovered since. Everything else is good to go though. Hopefully someone else knows better than me <--- which isn't asking for much, hahaha.