This shape was optimized analytically for the velocity/pressure distributions at the chosen speed range of 80~85 mph. [Laminar flow thingy!] Add 100, 200 or 300 mph and it all changes.
Actually, until we get to much higher Rn the lowest drag shape will be a natural laminar flow design very close to a NACA 66xxx to 67xxx. Above 100 million Rn, there's a small advantage to moving the max thickness point a little more forward. Anyone building for up to 400 mph is well below this.
Above 500 mph, we're getting into transonics and that leads to super-critical airfoils with less laminar flow and flatter velocity profiles. Supersonic, we go towards "bi-convex" airfoils to minimize wave drag. In all of this, the separation drag at the rear and under the vehicle is the biggest area of improvement available for LSR.