I know one RC pilot that could probably handle a plane with CG further back then 37%... but even he wouldn't like it. He balances about everything at 35% (which was quite entertaining when he balanced a flying wing at 35%... the design was unstable further back than 18%... but this guy was good enough to fly it that way.)
Please show the airfoil selection that is "balanced" at 37-%. That would be one weird as* airfoil wouldn't it????
The center of gravity can't be behind the center of lift, unless you can defy the laws of physics........well maybe with a killer gyro..........
Jetts