Hi there. I developed the demo and this is basically exactly what I do...the only difference is apply a multiplier to slow it down. I mentioned in the Medium post about this I am traveling and unfortunately didn't have access to anything but my MacBook Pro and my girlfriend's Air.

That said, seems like a common criticism is scroll speed is too slow, so by changing a couple small params, I halved all the scroll speeds.

I might totally be missing something, but seems like the concern is just relationship of scroll to movement of objects which I define in a big object. That said, I am no JS whiz and might be doing it all wrong.