Tell me if I’m doing it right or a fkn idiot

Hello friends happy 4:20. ,

So a few of my leaves are looking like a calcium or magnesium deficiency , maybe even phosphorus deficiency. And it’s time to change the res water. Dwc. LED 67L (18gallon) Rubbermaid. Nearing end of flower(I think)

Iv noticed a slow down and no change for a bit.

So my tap water starts at 180. I put 100ppm of grotek cal-max. To bring it to 280ppm.
Next I add epsom salt to 317ppm. That’s 37ppm Epsom.

Next I add GH MAXIBLOOM to 542ppm. That’s 225ppm bloom nutes.

Next I add GH kool bloom powder to 622ppm. That’s 80ppm

I will then pH to 5.8.

I’m going to stop there. I don’t want any more burning, so I am fine with this total ppm. Plants have been burning with 800-900 ppm

So what do you think? I’m hoping the tops to be done in a week.. I will next attach some pics.

I am concerned about the proper RATIOS to prevent lockouts from too much X or Y. Problem is I don’t know what my 180ppm rap water is made of..

I am also concerned about the 2-0-0 calmax during the end of flower..?

The very bad looking leaves are directly under the LEDs and I believe they are damaged due to being too close.