I had a similar experience this afternoon with YPF. When price tested support I waited until I saw momo on L1/L2/T&S. Entry at 26.42 on crosshairs in attached image. My stop on this volatile stock was the ATR14 against, and when the stock whipsawed upwards I exited for a 10c loss.
Obviously my exit resulted in the price action then ticking downwards in what would have been a gain of just above 50c.
On reviewing this trade I would enter at the same point if I had my time again, however in higher ATR stocks with a wider spread my stop would be 1.5 times ATR (position sized accordingly) this giving me adequate wiggle room based on the recent price action.
Fascinating this trading business
Aaron