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Howto improve performance for these queries, why is my indexed view making it worse for most of them and how can I change that?

for the record, this is a rewrite of the following question (you do not have to read that because I include all important data here) Howto improve performance for queries against table without primary ...
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Howto improve performance for queries against table without primary key without changing the query or the table directly? [closed]

UPDATE: I included some updated information in this question, because there was no way of progressing here given the previous constraints. Scroll to the bold-faced paragraphs to see my updates; I ...