Nice knife. The hook looks OK size to me, but I would have carried the finger notch back to directly below the first rivet.
I personally recommend not putting a gut hook on a blade. I would make a hunter just like yours with no hook, and make a separate tool with only the gut hook. Make the handles match. There are so many problems with having a gut hook on a nice knife. The sheath, accidental pokes and cuts, problems in skinning, and keeping it sharp are just a few.