I would agree that the difference in speed is not going to be as importance as the quietness of the arrow. J you did not mention your feather set up. A low profile feather would go a long way in quieting the arrow like the A&A or similar style.
You did talk about feathers in another post on fletching but I don’t believe you said what you had decided on.
Speed Goats are fun to hunt .Good luck You have a good set up that should bolster your confidence.:D