I am interested in using the Forerunner 945 for running in a heart rate zone. My concern is the vibration alert. I have a Fenix 3 and the vibration alert is imperceptible, and only occurring every 30 seconds. When I am running I need something to provide a noticeable alert, preferable frequently, to get my attention. I do not want use the sound alert in conjunction. My current Polar watch does a great job alerting me when I am out of the zone, but does not have nearly the breadth of analysis that the Garmin does. Does the 945 provide a high and frequent vibration. Or, is there a way to adjust the watch to provide this notification?