Im using the shield cut feathers and notice they are noisy, and suggestions on feathers.
Most say parabolic a quieter,but if you get your arrows tuned really well you won't hear much difference.
I find that shields and especially high cut shields commonly make a bit of noise, parabolics are consistently quiet.
Feather height and condition have more to do with making noise than shape, though shields are a tad louder than parabolic. I've been using shields for about 40 years. Can't say the small noise they make has ever cost me a critter, well, maybe a squirrel or two.
Shields are a little noisier but much cooler looking, imo. Real wild turkey feathers are usually stiffer and quieter in shield cut for me. I run 4x4".
Squirrels and other small critters usually react to the noise pretty darn fast. At least that's my excuse and sticking with it, lol.
I got some 5inch by 5/8th inch shield cut feathers and boy they are really loud in flight and in the quiver compared to my 5 inch by 1/2 inch tall hand cut feathers.
It don't matter what cut you use for feathers, the animal will still hear it.
It's when they are raising their heads to listen to what that noise is that you hope your arrow gets there before they identify just what that noise is. :-)
maybe your arrow is to light/fast? or slightly out of tune?
Sticksntones got me started with EFOC arrows. I watched a video on fletching up these arrows with front mounted boat anchors and the author recommended a mini delta shaped feather with a rear edge perpendicular to the shaft. If you ever get a chance to visit the Air and Space museum in Wash D.C., take a look at the X-15 that was used to break the speed of sound. I expected a super streamlined vertical stabilizer with a razor sharp rear edge. Instead it's a really thick trailing edge perpendicular to the fuselage. I tried it (2 1/4" feather with vertical rear edge) and I have to say it's the quietest arrow I've ever shot. Granted I'm hard of hearing (my wife says deaf), but I can't hear anything when that arrow flies and I can hear my shield and parabolic fletched arrows. Just something to think about.