Top leaves burning to a crisp, plants look terrible. Please help

Troubleshooting
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So i have these girls from clone. They looked great all the way through veg. But as soon as flower hit about 2 weeks ago they started to develop what looked like deficiency on the top leaves. I checked the ph of my runoff and realised it was 5.8 (soil) but ppm was 800 not bas for how big they are. so i went ahead and flushed to try and fix ph lockout Now theyve progressed so badly with so many different deficiencies in the past 5 days that im just going to start over. However i would love to know what i did wrong

Lights : mars hydro fce6500
Medium 50% happy frog 50% Ocean forest
Temps 72-80° rh 50-60%
Nutes: GH trio with added Cal Mag at 1/2 strength once a week
Week 2 of flower.

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What was the final flush PH and PPMs and did you follow up with a feeding :love_you_gesture:

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When i flushed the runoff ph went up to 6.4 and ppms were at 700. And yes i fed 1000ppm full GH trio and cal-mag after the flush as soon as they were dry enough to water again (48 hrs)

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