Flint and Friend- thanks for the kind words!
Buckeye- Yes, any change to your arrow length, weight, etc will change the trajectory of your arrows flight. Any change in trajectory will change your impact point. But it's as simple as coming up or down the string to accommodate.
I actually just did this last night at our club. I had a slight adjustment to my arrow recipe I made getting ready for turkey hunting on Saturday. Before I hit the course in our league night I stood at 25 yards and shot from my fixed crawl nock point. I was impacting low. So I loosened the brass nock, moved it a touch up the string and reshot. I had to iterate that process once more and found my 25 yard fixed crawl for my new arrow recipe. I then quickly shot from 5/10/15/20 yards to quickly map my new trajectory which didn't change much, then hit the course and noticed no change in accuracy.
The fixed crawl distance down the string is moveable and transferable to any arrow recipe changes you want to make.