Pinch not working on Magic Mouse

I am trialing Better Touch Tool as a replacement for Magic Prefs which I have used for years until updating my Mac OS recently (only to Catalina for now). I have always used the pinch gesture to reveal the app switcher in Magic Prefs, so selected this in Better Touch Tool. The problem is it only works some of the time, usually requiring multiple pinches to bring up the Switcher. What am I doing wrong? I'll be happy to buy if I can make this work as well as it used to in Magic Prefs!

Same issue here :confused: