I looked up the pair, 20 day ATR is 0.0116 so it's easy to be taken out with a 20 pip stop. Were you looking for a short term move, or overnight?
+ BOT 1 CRM - FEB 15 '13 + MAR 15 '13 175 Call Calendar Spread 5.20 USD SMART 11:27:21 OptTrader 3.84 null earnings calender...
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116 pips. When you said stopped out last night, I was not clear if it was a monitored trade (ie short term) or left overnight. If left overnight, little or no chance with 20 pips; typically you want 1.5 to 2 times the ATR to be safe from noise on swing trades.
Well with swing trading you are hitting for the fences rather than bunting. You will be looking for at least 400 pips profit. Anything less than 1 ATR and basically your are subject to being taken out by noise. If you are good at picking your entry spot you could get away with 1 to 1.5 ATR. Reduce your position size so that the wider stop is within your risk limit, or else stick to day trading. I'm not sure how IB is with forex trading below the minimum size, they say it's handled differently so you'll have to check.