Double Creek,
Everything you tie in your string has to be brought in motion when you release.
So the more weight, the more loss.
However, you still need something in your string to get a arrow to the target.
Start with strands itself, to serving, to nockingpoints and peep.
So, just keep it simple as possible and let it be.

If you really need to know exact, use the same calculation as you use on the arrow.
Just add the weight to the arrow in your setup and you have the answer.