Quote from cscott:
Bit, this thread is not about which is better to trade. I am trying to figure out why Stops execute so far away. I hope IB jumps back in and answers my previous post about what they meant when they stated that it is not their fault or the bank's, but "it's just a function of the market".
In the FX market the banks have inside knowledge of large orders.
The banks will lower their bids when they know the market
is going to fall sharply. In fact they will sell ahead of the order
themselves and buy back after the order has taken the market
down.
This is perfectly legal as insider trading is legal in FX.