JJ,
I prefer the mag (larger) size Pack Rack and you get beyond the plastic sound if you hold them tightly in the palms of your hand.
When I rattle, I do not tickle or half-arse "click" them, I stage an all-out war. Brush piles get "fallen into", small trees get snapped, leaves get kicked etc.
Here are several that met their fate via the Pack Rack (and a bullet) using the above method.