I’m a KISS guy when I tune carbon. I cut them to length to remove that variable then tune with point weight…hasn’t failed me yet. Plus I’m not fighting with arrows longer than they need to be….YMMV
I would hope there wouldn't be much of a fight with an arrow an inch too long. Your approach will possibly work if you don't care how heavy your arrows are. I prefer picking the point weight I want to shoot. When you find the correct length, all are cut that length.
Your approach likely won't work at all for someone with a short draw. Let's say someone buys arrows spined for a 50 lb bow but has a 26" draw. Cut those arrows that short and it might take 300 grains to get them shooting. Personally, I prefer not to shoot boat anchors.
