nute burn help during flower

Growing 2 bluedreams and 1 purple og kush in their own 14g tubs.
Using GH 3 part flora series and worm poop tea
Tap water with a base of 82 ppm
600w hps with proper ventilation. Air temps are between 72 and 81.

I was using the wrong nute information and was running in the 1100's. Bottom leaves got crispy and worked their way up. But since I flushed and dropped the ppm's down to 300-400, they still are getting crispy leaves.

Should I have put just pure tap water in the tubs for a couple of days and then move the ppm's up? I'm 3 weeks into flower and don't want to ruin my first harvest... I have bloombastic and big bud just waiting to be used but seems like it'll be overkill since I still have nute burn symptoms. Please help

Need some pics man. Also what week of flower are you in? 1100 isn't all that high if you are a few weeks into flower. Mine at 5 weeks and I'm in the 900 range. After you flushed, did new leaves become burnt? Did you do a complete flush?

I was using the GH dwc nutrient guide and started with a 1/4 dose but seemed like I was having deficiencies and upped the dose to where I was around 1100 using the .7 scale.
Here's a photo and I can't pin point what the exact issue is. It has to be nute burn but also seems like there's something else.
Last night the worst plant took a dive in ph down to 4.2. I dumped and flushed and then filled with straight water.

Please look at the pic all and give a brother a hand. I'm 3 weeks from first pistols.

Temps are all in check. PH is usually between 5.4 to 6.2. Humidity is low around 38%. No co2.
I did add a small amount of big bud in the last change as well even though I probably shouldn't have. But it was a 1/4 dose.

I can't tell anything from that pic. Need one with lights off.

I'll try to get another but I can see it in the pic. All fan leaves have canoed and crispy... tips rolling up, not down.

from that pic looks like light burn not nutes. is it worse at the top or bottom of plant?

It's more of the top leaves. But even before this, I would still get crispy leaves that started at the bottom and moved up. But you may be right. I keep the light around 16th away but figured it was not so close...

Atami does not list the NPK at the site of Bloombastic.

I'll bet the P is to high! They do say to not use until the bulking phase. That tells me the P is high.

To much P to early.

Please look at these and tell me how I'm doing. Or what I'm doing wrong. 3 weeks and a few days from sex

Thank you everyone for your help so far. Hopefully with the new pics you'll be able to see better.
To be clear, I have not used any bloombastic yet. Only a 1/4 dose of big bud.