
I missed the tags, apologies mate!
Nimmy is a true landrace, I suspect she's quite nute sensitive, but it doesn't look like anything along those lines, maybe just the opposite... top-botton overall pale color smacks more of S defc., typically that shows worst on tops but not always...
pH is a little low, but not bad,... S does lock out under acidic pH but yours isn't low enough IMO, so maybe a simple lack-of deal here.. You can do a epsom salt foliar spray for a MgSO4 boost-

about one level 1tsp/L, with wetting agent/castille soap to make it coat and stick better, tops and bottoms especially for leaves... best done out of direct Sun until dry... I leave it sit to dry, then respray with plain low ppm water to redissolve and get more in there. Remember, more stomata on on the undersides of the leaves vs. topside!
I see thrips/larvae signs, not mites in those pics, far too large to be mites, wrong shape too... They poke and suck juices leaving open spots for opportunistic fungal attacks, I think that's what's up with the necrotic spots...
Red stem streaks may be normal expression, but it also comes with underfeeding sometimes,... does the main stem show it too?
Wet humid, hot, all make for lousy VPD, but the Nimmy is adapted to that better than most!
GS is low on pH for sure, might be some lockout happening now,...
Sure looks like some N defc. to me mate, always lowers first and worst! Might be underfed as well, some S defc. too,...
....tell me about the Powerfed, NPK#'s and dosage, etc.,... kinda thinking it's not the culprit?
Did you get a recommendation from
@hecno for micronutes? If you have kelp, add that into the foliar spray, and any humic-fulvic you have too, they work better together! Dose the soil with kelp/humic-fulvic too...
The dolo', handfuls are too much if you are being literal! Is it nearly powder fine? It's not a disaster by any means, but the problem is it's marooned on the surface mostly, slow to dissolve and penetrate deeper to deal with acidic pH,... takes a while even as a powder, dolo' is the slowest acting form of lime....