I’m just gonna say that…
1) 5” feathers will mask a multitude of sins. Don’t ask me how I know.
2) Even if you’re OK with the possibility that you’re not tuned as well as it appears, you might want to re-check your “bullet holes” at 10 yards and/or 15 or 20…. And maybe even 2-3 yards just to rule out the possibility that there’s some big correction occurring right off the bat.
3) If you test them at a good range of distances and everything looks right, then who cares what a spine chart or a calculator says? I’d just suggest that if you do discover that your solution is substantially different from the typical expectations…. don’t recommend what works for you to others - at least not without a disclaimer about being different… A lot of folks get way too much feedback from the fringes and convince themselves that they need to change everything when what they’re already using really should be right on the money….
I’ve been really fortunate in that Stu’s spine calculator seems to put me dead nuts, or just a shade weak, bare-shaft…. Which is an alternate pronunciation of Dead Nuts. But my results come with carbon arrows cut to my length (28”) which basically NOBODY does these days… So I try not to push my solution to someone who’s going to be shooting arrows 10% longer….