Unknown damage on underside of leaf veins

Been spraying athena IPM once every three days and dr zymes full strength in between each Athena spray. Been having this issue for a couple of weeks while progression has slowed it is still spreading.

No webs, when I shake the plant nothing falls off
 

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I havent seen anything it has happened to every crop ive had sine the orignal post however come early flower and late veg the issue goes away totally and doesnt come up until the next stock I dont see anything concurrent with thrip damage nor spider mites so weird
 
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