Little help with my d* please

So here is the deal my Death Star is having issues. She was in veg for probably 2 months and I am sure I didn't nute her enough so she is now showing issues. I can't decide if I have mg deficiency or something else so please see pics. I use RO water and add calmag at 5ml/gal. My temp range is solid at 72-82. She is in ffhf soil and is watered every other day on a water, nute, blackstrap rotation. Ppm on nute days never is above 800 and usually not below 700 at this time. So my other thought was maybe over watering although the soil is bone dry on current schedule. Also the issue is mostly on fan leaves.

thanks RIU members......

Definitely a deficiency, can be Nutrient driven or stress due to heat. Lights may be too close, your water may be too hot.

I've grown with little more than water with hardly any issues, I'd say your problem isn't under watering, or underfeeding.

About all I can offer but can cross those off the list.

i think you tried to make up for the time you did not feed her enough nut
just lower your PH to 55 snd go one week with no nut then start by 650 ppm