Here is another example about knowing what you are doing. Give Willie M. or Minnesota Fats a broom handle and a cube of chalk. You will probably get beat.
You can't go to a fat shaft and not resight & retune the bow. I use to do what you are doing but I had to sights that were preset and the arrows were the same OD. 23/64ths. One weighed about 400 grains the other 500. So I didn't have to retune and just swapped the sights which was easy because they were dovetailed bases and the same brand.I'm a new shooter who is shooting hunter class. I only have one bow and I'm trying to avoid going from 68lbs down to 58lbs and re-sighting just for a weekend shoot.