First I'd like to say how happy I am with the theme and what a great job you did. I love the shopping cart, the general look and the ease of use in wordpress.
I am having a problem with very low quality images generated for the featured products on the home page ( http://www.amitiewines.com ) and the shop landing page ( http://www.amitiewines.com/shop/ ). These were uploaded as much larger product images ( 930 × 930 ).
I also tried regenerating thumbnails (Regenerate Thumbnails plugin) - what was recommended in some similar posts, but this did not work for me.
Thanks for any help you can give!