Hi James,
1. Make sure that only the “product” custom post type is selected under the General Options -> Sources panel, and not “product_variation”: https://i.imgur.com/Y7vzqzg.png
That will eleminate displaying product variations as results.
2. The only reason I can see is that probably the images were not uploaded/added correctly. The plugin requests the images from WooCommerce, and if it works on other products, then the issue is most likely with those products.
3. Yes, by partial/fuzzy matching. You can change that via the search keyword logic settings.
Depending on how strict you want the results, and if you want a primar/secondary logic combination, you can try:
– AND with exact keyword matches (primary) + AND (secondary)
– AND with exact keyword matches (primary) + OR (secondary)
..those logic combinations usually work quite well.