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Many connections and dualities in representation theory can be explained using quasi-hereditary covers in the sense of Rouquier. The concepts of relative dominant and codominant dimension with respect to a module, introduced recently by the first-named author, are important tools to evaluate and classify quasi-hereditary covers. In this paper, we prove that the relative dominant dimension of the regular module of a quasi-hereditary algebra with a simple preserving duality with respect to a summand of a characteristic tilting module equals twice the relative dominant dimension of a characteristic tilting module with respect to . To resolve the Temperley-Lieb algebras of infinite global dimension, we apply this result to the class of Schur algebras and the -tensor power of the 2-dimensional module and we completely determine the relative dominant dimension of the Schur algebra with respect to . The -analogues of these results are also obtained. As a byproduct, we obtain a Hemmer-Nakano type result connecting the Ringel duals of -Schur algebras and Temperley-Lieb algebras. From the point of view of Temperley-Lieb algebras, we obtain the first complete classification of their connection to their quasi-hereditary covers formed by Ringel duals of -Schur algebras. These results are compatible with the integral setup, and we use them to deduce that the Ringel dual of a -Schur algebra over the ring of Laurent polynomials over the integers together with some projective module is the best quasi-hereditary cover of the integral Temperley-Lieb algebra.