However, based on the simplistic nature of your current airfoil, almost all performance (suitable for RC Sailplanes) airfoils presented here, would require more building skills to reproduce accurately.
Can you clarify this? What current airfoil? What does "simplistic nature" mean. Sorry, I just didn't follow.
Our guy soarbird has a laser cutter lined up, so accurate ribs for his project shouldn't be a problem, and the airfoils we are suggesting are specially designed to have very little cuvature in the areas covered by thin film, so they maintain accuracy. They also have half the profile drag of the E231 at these Reynolds numbers.