The problem with such studies it lacks evidence , so basically we're taking your word for it .Until now the issue isn't clear to me , so if it goes against you your trade is accepted and if it goes your way it's rejected ? i don't see how , many MT4 platforms accept trades when it goes your way but will give you slippage with it . Can you clarify more and maybe post your EA here .
Google FXCM fined or Gain Capital fined. You will see exactly how they do it and why.