Are you shooting a plastic rest or off the shelf?
They do make a vane for recurves now, supposedly usable off the shelf.
I dunno, i just run feathers on everything.
Porpoising sounds like there could be nockpoint and or fletching crashing the rest. Could be brace too.
Even if using an elevated rest, normal vanes probably gonna crash it to some degree.
Feathers, w nock rotated for minimal possible rest/ shelf contact, slightly high nock point. Should be close
