I also have a BS in Aero Engrg, as well as many years of modeling design and flying. If you have found published airfoil data at the appropriate reynolds number, I would be suprised. Considering the extremely low RN at which models operate, extrapolation from the published data is highly suspect. Another practical consideration is how accurately the typical construction methods reproduce the selected airfoil surface. A foam core wing can hold the shape OK but is only as accurate as the cutting process, and a built up wing can be drastically off due to sags even though the ribs are accurately cut. With these and other such considerations of trying to apply full scale data to model design, I've found that based on sound aerodynamic principles, the TLAR approach can yield very good results. I have recently completed two models using this intuitive approach, and the flying is exceptional. One has a high wing with a rectangular planform that has a setup similar to a "stick", but with a cabin, spinner and wheelpants, it dosen't look like a stick. The other is a low wing with a tapered planform and real outboard ailerons. If you just enjoy doing all the calculations, by all means have at it, but the TLAR method is a perfectly good design tool.