Hey guys its me again . First grow so bear with me . Everything was going well up till week 4 .

Strain is punch cake from elev8 or aka wedding crashers symbiotic seeds
My set up is a 1000 watt hps prarbolic reflector.
23 degrees celcius lights on temp with about 40 to 45% humidity. I am feeding them GH flora trio
4ml micro 3 ml gro 5 ml bloom , 5 ml terpinator , and 1/8 tsp of open sesame on feed days starting flower week 1 through 4 .
And also water every other feed with around 3 to 5ml cal mag.

I was hitting them low with 600 ppm till week 4 i tried to bump it up to 750ppm and switching from open seasme to beastie bloomz and saw some tips got a very slight burn.i also at the time noticed some purple stems and the brown spots starting on the bigger fan leaves . .
Pistils also prematurely browning as well. And pale leaves on the plants affected the most .

Today which would be week 5 for me .
Figuring after the light flush with cal mag would bring help the brown spots out. And being in week 5 i should switch to full bloom recipe of 3ml micro 1 gro 8 bloom + 5ml terpinator + 1/8 tsp beastie bloomz . Ph to 6.5 and total ppm of 700. My run off was coming out highers on some plants . Over 1000 in a few . Some were over 200 ppm . The spots are spreading to even the sugar leaves on the actual bud. Rusting up and can be cracked theyre so dry . The problems also seems to be happening to quickly in the middle of the canopy the left side and right side seems to be more healthy overall. If this continues am i fucked?

Got scared again and immediately flushed with straight 6.5 phed tap water . Total ppm 180 out of tap . I will have to wait 2 to 3 days before they dry out again . Duno what to do then will decide after i try a run off and ph run off test i guess?

Is it cal mag deficiency? Or phosphorous because im in week 5 flower and they need it.
I dont understand how i got salt lock because i have been feeding fairly low and was seeing deficiencies not toxicity ever from veg up until now .


Im really freaking out that i may have fucked up a pretty decent grow that was going so well.

Have been searching forums all day please i need a second opinion!!

Thanks fellas in advance!
Oh btw i was also using recharge every watering from veg and stopped using it week 4 flower cause i ran out and read should stop using it late flower.

Pics below sorry for the hps lighting i can retake later when theyre off if yall need to help diagnose.





I was worried i burned them a little , and also guessing cal mag deficiency . So i did a fairly heavy flush with ph water of 6.5 and some cal mag .