I think you are stubbornly fighting doing it the Sigil way
Sigil uses H levels (in your case h1-5) to auto generate the NCX
(your CSS can assign the same style to all those, if that is what you want in the book). Ctrl+the H digit to quick reassign the current cursor BLOCKS TAG to the H#
Toxaris suggestion to drag the HTML section files to the proper order. (I have touched up books with 150+ TOC items. No problem)
Then regenerate the NCX . You can adjust the levels here. You can even Edit that heading here. click OK
BTW If you hover over the column head in the TOC generator, you will see a summary count of each level
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