I think it is important to choose a sight pin or aperture, when you are shooting and aiming with some level of understanding. I don't mean that in a smart way.
I remember when I started shooting I made a 14" extension for my sight expecting it to be more accurate!!!!
I based my idea on a misunderstanding.... and it was a failure... any slight wobble was magnified and became very distracting.
I have tried most of the apertures with different insides. BUT.... if I consider first, what I want from the sight, I have a better idea of what I need to look through, or aim with.
One of the things I am guilty of when shooting, is aiming too hard and forgetting to keep on drawing the bow. A really bright fibre optic draws attention to itself and I find it distracts me from the shot process far more than is good for my scores.
With an empty ring, I can aim without really taking so much notice of the sight. IF I can see all the gold, the ring must be round the gold not breaking through it. I can focus on making, or finishing the shot with less distraction.
Even the size of the ring can play a part. If it fits too closely round the gold, any movements cause a red crescent to appear at some point round the gold and that is distracting.A slightly larger ring, produces a red border that doesn't become so narrow on one side that it disappears causing the red crescent to suddenly pop into view at the opposite side of the gold.
I feel that learning to shoot while aiming gently is worth experiencing. Get that feeling and then try the more demanding elements from a position of control, knowing how to finish the shots strongly.