pH feed at 8.2 by mistake now the plants are dieing.

So I checked my run off and it was reading 8.2 in Coco! Such a stupid mistake on my part. Alot of leaves are curling up,/wilting/ twisting and going bronze colour.
I've just flushed them through with pH 5.9 but is there anything else I can do , literally about 3weeks from finish !

FLUSH with a ph'ed nutes……...

no, and i wouldn't worry about it at this point. you already did about all there is to do, now just don't do it again, and they should be fine for the three weeks left. many strains show more senescence (the natural fading and yellowing of an older plant) than others, right now i have a WW and a snake venom at exactly the same age, and the WW is yellow as hell, while the snake venom is still nice and green, same feed, same everything, and they'll produce very close to the same amount. don't worry about it 3 weeks from harvest. just try not to do it again.

Thanks guys . I think it was made all the worse because I used pyrethrum solution of pH 8.2 so poison+ bad pH.
Hoping it will be all ok

just feed half strength nutes maybe 500ppm until finish

I wouldn't be surprised if it takes a couple flushes to get he medium ph down

im told in coco, you shouldn't flush with plain water but instead flush with half strength nutes

So it appears I've seriously damaged 4/12 plants. One was an auto that died and has been chopped, the other 3 were some of my best plants under the 1000w side of my tent .
Atleast Ive still got some weight on the girls in question.