I agree, you are relying too much on the relax of the turbosmooth to round the corners. It's your high poly model, don't worry about adding more geometry to better control things. Awesome high poly models aren't 16polys that happen to turbosmooth into the right shape, round that stuff out on your own. Also with something…
Sure, there isn't anything wrong with yours, the point I was making was: What he wanted to do had nothing to do with how detailed or not detailed the corners were, it was the flow into the inset area that mattered. So the "more geo" as a response to his problem doesn't make much sense.
"More Geometry" don't relie on the subdivision to give you the curved corners bevel them to the shape you want and use subdivision to smooth them out more. you should never relie on subdivision to make a shape. just chamfer/bevel your corner edges(maybe twice), than inset the front and back face once or twice to create a…