I'm not aware of any over the counter strings that offer light on the top and medium on the bottom. I suspect that Elixir, working with Taylor developed these strings to help tame excess highs that occur with some Taylor models. Usually it's the opposite where people want more bass projection and would go the 12-56 route as in "bluegrass" strings.
Having said that, one can always try round core strings like DR's Sunbeams where, while the gauge is a standard 12-54 (light) the heavier strings feel lighter because the winding have less grip on the core, as opposed to standard hexcore strings. Additionally, one could try Straight Up Strings or alternately Santa Cruz (the coated version of SUS strings) which are designed so that the gauge is engineered into the targeted tension rather than the tension being a by-product of gauge.
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Assuming is not knowing. Knowing is NOT the same as understanding. There is a difference between compassion and wisdom, however compassion cannot supplant wisdom, and wisdom can not occur without understanding. facts don't care about your feelings and FEELINGS ALONE MAKE FOR TERRIBLE, often irreversible DECISIONS 
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