Spotting & Leathery leaves

I look at the deficiency charts and it could be a few of them. Thought I would see if anyone had this and cured it.

These plants are flowering week 3-4 range.
The pics of spotted and yellow sections are one challenge.

Another challenge is I have a couple plants which the dark green leaves are starting to look a little leathery and dried. The soil is nice and moist but my other plants the soil dries up much faster so I am guessing not real strong root development.

Thoughts?
Thanks!

third pics looks familiar to me looks like mine when i had too much nitrogen the leaf tips are curling down..
kind of newbie so its all i can say really

RooR

LOOK under where your hand is.....See if theres any black spots...
Beech

Firist 2 pics look like nute burn. 3rd one looks like over watering.

Man do a little more research, I've been out of the loop for a while but if I remember correctly, there is a specific deficiency that causes the leathery leaves. Also maybe a zinc def on those or something too, its hard to say. I bet your ph is off. Test the ph of the water coming out of the bottom of the pot, that will give you a better idea of what's going on in that soil, or soilless. Deficiencies have always been real simple for me. I can only speak for myself here but I know I'm giving those plants everything they need. If something isn't right deficiency wise its 90 percent of the time ph in my experience.

Thanks for the inputs.
Couple more details. I'm using Hesi products (starter kit) but only about 15% of what the bottle recommends as I heard/read they are too strong and burn. I'm a few days into water only to see if it helps.
PH going in is always 6-6.3. I've never measured it on the way out but honestly I don't tend to let them run off too too much. I'm using soiless mix. I'll let the leathery one or two I have dry out more and see. Might be too late for great recovery but weeks into flowering there isn't much life left anyway.

I would let them mos def dry up a lil and then water straight h2o on the next feeding. Doesn't look to be a pest problem but more of some type of nute deficiencies