How large are they??

There is always a compromise between visibility and dead nuts persision when it comes to pins.

I shoot .019 now and see no real " hunting" accuracy diff between them and the .029 I have shot for years.

if I am on a 5-spot target and looking for x' s I may opt for the smaller pin.

At 25 yds a .029 pin only covers 7/8th inch of the target so it cant hurt accuracy to much.

maybe your cousin is just a better shot