RE: best long range fletching
I’m not as technically trained as some, but I think my opinion is still valid here.
If your fletching stabilizes your arrow at 20 yds, it will still have it stabilized at 50 yds. Quick spins and some of these other “high stability” options get your arrow stabilized fast, and under non-ideal conditions (broadhead, imperfect tuning, etc). But generally they do so at a higher loss of velocity over distance. If you’ve got a well tuned bow/arrow and a head that flies excellent, you won’t need much fletching help.
So what you are going to have to consider now is, how well tuned is your bow/arrow combo presently, and how much velocity you can tolerate losing. If you’ve got a laser beam tuned bow already, probably most any standard 3” druavane, vanetec etc fletching will handle your job. BUT if a blazer, quickspin, or helical fletch is needed to stabilize your current arrow, then you can stick with that, or attempt to tune your bow/arrow combo better.
For instance my current setup uses 3” vanetecs and I have no issues at all shooting out to 50 yds and maintaining accuracy and good arrow flight.