To those who can get good consistent bareshaft flight past 10-15 yards I salute you… maybe it’s the bow I currently shoot combined with my grip, or arrow spine, but at 15-20 yards I have a hard time with perfectly consistent bullet holes no matter how hard I try. I start close to paper, work back to the length of my garage and that’s about as good as I can get. Decent results from that point with big fixed heads, but still not perfect. Don’t forget to shoot some fletched through paper as well, I was getting fletching contact with my drop away that of course bare shafts weren’t showing, that goofed me up for 6 months. Also, if you’re going to shoot heavier lighted nocks might as well buy the practice nocks to match those if they’re available.
Are you shooting bareshafts through paper at 20 yards? I haven't heard of that before. Most compare bareshafts to fletched point of impact and angle in target at that distance.
It does become hyper critical of form, tune, and wind at that range.
Also, "perfect" bareshaft flight at that range is sometimes a bit overstated. Someone on archerytalk will post a hero picture of a bareshaft and fletched touching at 40 yards and declare perfection (same thing as posting 100 yard groups and acting like you do that all day).
I tune bareshafts and fletched at 25 yards until they are close enough to same impact that they look like my normal groups at that range, which is around tennis ball sized. I shoot multiples to make sure it wasn't a fluke that made them touch (some folks tend to think bad stuff might be due to chance but a randomly good thing is obviously not due chance...common bias). I also look for kick in the bareshaft. My bow at 265 fps is slow enough that in good lighting I can watch the arrow. If the bareshaft behaves and goes down range like a little laser, then that's important to me.
But the proof in the pudding for a hunter is how your fixed blade broadheads fly.
If someone is having issues with shooting bareshafts at 20 or more yards due to needing to work on their grip, then I'd suggest getting perfect bullet holes through paper with bareshafts at close range and then getting broadheads and field points to hit together at the farthest range you will shoot at game.....and just skip the long range bareshaft tuning for the time being. It is common to chase your tail with bareshafts due to inconsistency and you are just randomly de-tuning your bow based upon what the wind or your grip did on the last few shots.