I hope I will find more time to have a deeper look into this but here is my immediately comment:
Some months ago I adjust your "first book of a serie" so that it shows "the oldest (download date) unread book of each author". I assume with your new search I can do that as well.
About the second issue, if I understand that correct. This effect is also visible using this new search when you enter any other filter before. E.g. search "David". Search "summarize...". If so, that may confuse.
Only as a quick idea: adding parameter-field for sort and sort-order.
Could that avoid the cumulative issue as you do not need "to look at the screen"?
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