I adjusted that page results number to 300 and it worked to display all items as expected. Not sure why that needs to be that high, maybe related to the auto calc of items of each post type (setting to equal out was enabled). Tested both date filter on and off and worked fine at 300. It also worked fine at 200 for items I knew would have fewer results, fwiw.
Since I expect to use a date exclude function for the main search, having that high of a number likely should not matter.
The redundancy issue is still a real problem though, so if there is a way to only pull that first instance of an item that would solve many issues.
Thank you.