This is a power store site. Power Store does not support the type of shipping you are trying to create.
For the drop ship products, edit the product, on the Additional settings tab, you can set the per item shipping rate and set it to exclude from all shipping rules.
Power store does not support a weight range for this option though.
With the paypal express checkout, the user will go to the paypal site to set the shipping and billing address, they are then redirected back to your site, when they are redirected back, the shipping will be applied and they can confirm the order.