smitchell : start by erasing all gestures inside the recognizer, and add a new gesture, named "swipe-left", for example, with that kind of points "584,185|584,185|584,185|584,185|577,185|566,185|548,183|548,183|535,181|521,179|508,178|502,178|494,177|487,177|481,177|476,177|473,177|471,177|466,177|461,177|454,177|448,177|443,177|438,177|434,177|426,177|420,177|412,177|405,176|400,176|396,176|393,176|390,176|387,177|379,177|373,178|368,177|365,177|357,177|354,177|350,177|345,177|340,178|336,178|334,178|333,178|332,179|332,179|332,179"
Now, when you detect that gesture with a confidence, say, over 0.75, it's a swipe left gesture.
If you still have some problems, you can post here your capx.