I really think its in the hands of the pilot that can get a stall or avoid one,no need for gimmicks sometimes. This is a CMP product,a low end manufacturer,some aircraft maybe misaligned,and some may fly quite well,check your incidences and wing panels for warping,maybe a cleaned up one will need no mods and fly nicely.I would never modify an airframe without going for a test run first and making sure things are as good as you can get them before flight.