Hi HoGo,
Those image settings are not used for the theme’s main product image, as the size of the product area is set via CSS – we override this to ensure the quality of the imagery. I have just noticed it’s at 600 when it should be 700, so have fixed that, thank you for pointing that out. That will be in the update this week, although happy to send it over to you sooner if needed.
For #1, is this on the product detail page? Unfortunately variable products aren’t supported with AJAX (this is a WooCommerce shortcoming) – although we are working on making this possible ourselves in the near future. Currently the cart content will only show when a product is added via AJAX.
– Ed