Hey guys. I'm building my second small HLG non-RC free flight glider with wingspan 1 m. The most important thing is distance traveled in a straight line (My first glider could travel for 40 m before touching the ground). Last time I decided to use Clark-Y airfoil, but now I want to find something better than it. I have read some articles and post on forums. A lot of people recommend SD7037 or AG37, but I'm not sure which one is the best. Do you guy's have any ideas? Thanks in advance.