I have read this thread http://www.datafeedr.com/forums/showthread.php?t=3934
and it seems your exclude duplicates filter is not working properly, because most of my items meet even the 3 rules, but are still been returned in the search.
For example a product with same name, same price but 4 different colours, returns all the 4 same products, the same problem apply to product with 4 sizes.
It is easy for someone with 100 products to manually remove the other sizes or colour, but this is not feasible for a store with thousand of products.
Please let me know the best way to go around this problem