Why are you adding almost double the mag. That will throw off the cal/mag ratio and possibly lock the calcium out (it looks like a cal deficiency to me). Stick with the 3.6g Jack’s pro, 2.4g calnit, and 1.2g magnesium sulfate from seed to harvest.
Sounds a little warm to me, maybe you can get away with it in the autopot system.
I had to stop using this because it would make my pH skyrocket over 8+ pH. It may be causing pH swings as the nutrients get used up. At that high of pH all kinds of things get locked out.
You shouldn’t need extra calmag with Jack’s 321. Maybe you need some LITFA. 