I appreciate the response. I am basically doing 3 thru 5, unfortunately mine was purchased thru Apple's app store, not via Steam. But, technically I am placing the files within the same place within the app (that's the part where you select 'show package contents').
The only thing I can think of is that for some reason the actual app is different on the Steam app store version than the Apple app store version and how it interacts with the modified files. Again I'm using the latest version available on the Mac app store since like Steam it auto updates for me.