The tapered yellow post sleeve between the ramps appears to be upside down, which would cause air balls. This type of tapered sleeve is designed to have the narrow base at the bottom to prevent airballs. Also, I think that tapered sleeve is supposed to go one post over to the right, near the right spinner, or at least that's how my NGG came.
See the pic below, courtesy of Treasure Cove. This is how I've seen the post sleeves on all the NGG machines I've played set up.