Too many bells and whistles can’t get it to work for basic cart quantities.

I am sorry to read that you have had difficulties!

Firstly, I would like to ask you, if you still haven’t managed to configure the rules according to your needs, to open a support thread.

And secondly, any feedback on the specific information you were looking for and didn’t find will help us to improve / be more intuitive…

On our main help, we explain the selector “cart quantity”, the group-by options (which must he set to all grouped together), and shipping costs:
https://www.wp-centrics.com/help/fish-and-ships/conditional-selection-methods

…and you can find all together here, for example, but in this case the conditions are set by “product size” instead of “cart items”:
https://www.wp-centrics.com/shipping-rates-per-product-size-on-woocommerce/

Thanks in advance,
Carles Martin.