Without doing some more detailed testing you won't really have a full picture but all the trace elements (micronutrients) become less available as the pH gets higher (there's one exception but no need to go there) so lowering the pH should help unless you have an actual deficiency of iron or manganese in the soil. Most commonly it is simply a matter of lowering the pH to make what is already there available.
I don't think the scape turning partly brown is a problem. It is green on the side where the pod is, presumably to maintain the pod. I'm not sure what the problem is with the second picture. The third picture could possibly be nitrogen deficiency or leaf streak, maybe dryness. The fourth looks like some kind of mechanical/pest damage. The fifth is the interveinal chlorosis showing that it is worst on the young leaves and therefore an iron and/or manganese deficiency most likely related to high pH as mentioned. Some daylilies will do this even below pH7. If all yours are doing it then perhaps your pH is higher than that - let us know what the test shows. The flopped over middle leaf in the last picture is something I see here and have never figured out what causes it. It seems to correct itself over time as the leaf matures.
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