well, you cant use the cart taxable total in the shipping rules and include the shipping in the sales tax both, it is one or the other.
If you try to do both it will create an endless loop where it will have to recalculate the tax because shipping was added, then recalculate shipping because tax was added and so on and so on.
you would need to edit the shipping rules to use the cart subtotal instead of taxable total.
then go to the tax tab and check the option to include shipping in sales tax.