You should paper tune it. Bare shaft. That can tell you a lot about arrow flight.I shoot my other recurve pretty good so I dont think it's me but I bought this other one setup I've never tuned a recurve before
Nock height...start out too high and come down little by little until porpiosing is reduced.
Brace height is a little harder to figure out. The lower, the better but too low can cause wrist slap and also poor arrow flight.
How tight are your nocks? Too tight leads to poor arrow flight.
Twang...can be caused by too light of an arrow. 10 grains per bow pound is minimum. Heavier arrows shoot quieter.
Are you using any sting silencers? There are lots of good ones on the market, but I prefer beaver balls. They seem more traditional to me rather than cat whiskers or other synthetic silencers.
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