You should try out BetterTouchTool.
Specifically, to do what you want you'd add a two-finger swipe left for Finder and configure the action "⌘]" (or "⌘[" if you prefer) and the opposite action for swipe right.
I've been using BTT for a short while and add actions as I think of them or when I find suggestions for gestures on the internet for apps I use.