Not sure why you’re not getting the vibration on the Tack Analysis – the app does generate one.
Is your alert vibration disabled?
Menu (long right-button press from watch screen) ->Settings->System->Vibration: On and set to High)
Duration for display is a thorny issue – too long annoys some, too brief annoys others! It needs a User Control, which is in the #TODO list.
Meanwhile, you can review your tacks in the bar when you upload your track to raceQs replay.