If your broadheads are groupin' with your field tips that is looking pretty good!
I would re-test at 25 yards and 30 yards and see how it looks to be sure.
If you cannot wait for daylight and since you have 18 yards indoors to work with, you might check your field tips and broadheads on paper at about 6 to 10 feet. If they are flyin' straight through the paper, you will most likely be good to go at 25+ yards....
I will be interested in learning about the results!
Shoot straight, Shinken