One more consideration to blur the view:

If the Allen bolt does not work for you, make a plug with threaded holes to fit the slot, make sure it fits on a slight taper so it will not shift, then install the rest as on all other bows.

Next your D-loop appears to have 2 brass nocks inside it. In my opinion?? There should be nothing, or at least no more than short string nocks that can be rotated up and down the serving for tuning the bow.

Before the high-speed center shot bow some contact could be tolerable & may not affect flight so much when feathers were used.
But the flight of a high-speed arrow is another story; I cannot see the over 240 contact myself. Even if you fletched your own arrows the cost in time would be great.

As I have stated on other Posts, when you have new fletching look at it very careful in a good light & do the same after every shot. Notice what fletch & what side the contact is on, that will be one clue.

I use another rest, but when one calls the company (for the bow or rest) about this kind of problem they usually help with info about the set-up.