Arrow weight and FOC. I am an experienced 3D shooter. All my arrows are between the 9 and 10 gpp. I use 100 grains fieldtips, giving me a FOC around the 10 procent.
I can hit repeadly targets at 55 yards. I am deadly between the 10 and 35 yards. I trained and experimented a LOT for that. Setting up five different targets between the 15 and 55 yards. Getting a thrill when I shoot perfect, hitting all different targets with my first arrow
but that doesn't happen every day :( bad form and/or release are always waiting for a chance... The slightest mistake will be magnified at 50 yards...
I think FOC will show after 20 to 30 yards, dependant on how high your FOC actually is. Till 20 yards, different FOC's won't show much difference.
If I would shoot at 50 yards with a 30% FOC arrow however, it would drop like a rock. 10% FOC however, gives me a nice flat trajectory.
Modern hybrids act fine, but any good traditional recurve will do fine too.
For my Caribow Peregrine I use woodies, for my three pce Whippenstick Phoenix semi-static recurve I use carbons. Both arrows are around the 9.5 gpp and have a FOC around the 10% so I can switch very easily. I only need a few shots to get tuned in. Both arrows show the same trajectory, but the woodies seem the be more forgiven and less nervous. But in the end I shoot both set-ups equally wel.
I don't go under 9 gpp. That makes your arrows too nervous and unforgiven and besides that, it shortens the lifespan of your bows.
There is always a balance between speed and stability. The lighter the arrow, the more speed, thus a flatter trajectory, but the more unforgiven. You need some time to find that magic set-up that works for you.
Isn't our hobby wonderful?
My five cents...