deficiency in autoflower

[JP1]

This is a pretty standard issue with autopots and coco. I gave it up after a while. Personally I think it's too much calcium causing lockouts, but this is very common to autopots/coco. Look into the biotabs line. There's a bunch of European growers here that love them with autopots

 

[KingRatt]

You cite using "ph balanced water," which could be a mistake right there.

Using pH Perfect base nutes (with low ppm/EC, ideally RO, water) you should not be adjusting the pH! That is the whole idea of ph Perfect, which works best with zero/low ppm/EC/salts water. Adjusting the pH just means you are adding salts that are both unneeded and can only mess up the "Perfect" pH balancing of the base nutes. If your water has a high ppm/EC, you probably should not be using pH Perfect nutes.
[Check with Advanced Nutrients, which never tells you to adjust pH, search AFN and/or other sources. With well-chelated nutes, including pH Perfect and many finding MegaCrop works too, using inert media (here coco) If you start with good water and minimize adding salt supplements you don't need to and should not be adjusting pH either before or after mixing].

I didnt catch that! Very true!

 

[BII]

What is the EC/ppm of your source water?

You already have among the best nutes. Hard water is a known source of problems no matter what nutes you use.

I suggest using zero or very low ppm/EC water, either:
1) rain water or
2) ideally buy a basic reverse osmosis (RO)-including water filter system. For ex., I've been using Amazon product