List looks backwards to me? Try pushing values from the right hand side of the list onto the stack and replace the top 2 elements with the result of the operation when you push an operator?
so 3.0 6.0 / => pushes 3, 6 and then replaces them with 3.0 / 6.0 = 0.5 when the division operator is pushed.
reversing the list was the perfect strategy to evaluating the expression. Thanks Paradigm.