Why not consider going to the Westin Park Central? It's only about 2 miles further East on LBJ Freeway. Get off at Coit Road. I've stayed there many times and never had a problem with noise.
When the Sheraton Park Central, which is just across the parking lot, was under renovations, you could get a Westin room for a Sheraton price by booking at the Sheraton. Starwood would automatically transfer your reservation.