Any way to load more than 50 search results per query?

No. You can’t get more than 50:

If you have access to the data explorer plugin you can do a search like this to get all posts with the word:

SELECT p.id as post_id, user_id, topic_id from posts p
JOIN users u on u.id=user_id
where p.raw like '%WORD%'

and this to get them just for the user:

SELECT p.id as post_id, user_id, topic_id from posts p
JOIN users u on u.id=user_id
where p.raw like '%WORD%'
AND u.username='USERNAME'
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