I can get my Goldline River to fly straight and the rim feels similar to a Roc. If the GL is too flippy you could try an Opto River, they're supposed to be more overstable. You'll love the glide. JLS is a nice straight disc, so is the Polaris LS if you don't torque too hard. The Leopard folks are also offering sound advice. A light Champ Valkyrie or Sidewinder might work too.
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