Use FindsIndex for comparison, not endless browsing
FindsIndex is most useful after you have narrowed the search enough to compare real options. That means the product pages should be close enough that the details matter: photo quality, shape, color, sizing, category, price, and whether the link still points to the right item.
If every result feels unrelated, the problem is usually not the destination site. The problem is that the starting phrase was too broad. Return to the category page, choose the closest product family, then try one sharper phrase.
Quick test
If you can explain why you opened a result in one sentence, continue. If you cannot, go back and make the category or search phrase clearer.