Alright i need some serious help. I really thought the second grow would be easier since i know what i am doing and need to do but it is not going as well as i thought.

To start i need to make a correction with the plants The plant that i thought was a G-13 is actually a Lemon sour diesel(L.S.D) i guess there was a mix up when i picked them up...i dunno. So i have 2 white widow clones, 2 sharks breath clones, and 1 L.S.D.

Problem: The white widows look the best which i am happy about, white widow has been a fav of mine for a long time. The leaves on the white widow look beautiful green at the begging then start to yellow as they get bigger. Why?

Sharks breath are really yellow and kinda looked burned at the tips.

My bigest problem is the LSD the leaves are still curled and yellowing. When i touch the leaves they are hard almost like they are all dried up.

My setup:
They are in their own personal grow room
under a 600w MH light
room temp between 75-79
using age old organic grow
PH is a big problem it starts out 8.5 or higher i just did another treatment which has brought it to 7.2 will do another treatment tomorrow. Is the PH the main reason for all my problems and if so can yall give me some ideas on what is the best method to keep the PH down.
They were in soil and have been transplanted into hydro over a week ago. I know i said i wanted to try soil but i just dont like it; its hard for me to know when to water and i tend to over water so with hydro i know exactly how much water is needed and when. Trying to simplify my life a little more.
I think that is about all.
Thank you so much for your help i really am stuck and dont know what to do.
If you need pics just let me know and i will take some. They dont look pretty so i dont feel like taking pictures but will if needed.