I really like this- it's looking really good.
I did the same thing to my 'top hat' ball guide- I assumed you had already done that.
I believe the lip in that section is there because the balls don't exit the pod at 90degrees (which is also why the opening in I.D. of the socket is oblong), and tilting the 'top hat' allows the rounds to enter the tube in line with the axis of the tubing (or in your case, the axis of the adapter).