There's only one manufacturer of Deans connectors. There are crummy clones, but there is only one Deans connector.
Bending a curve in the contacts isn't necessary or beneficial. The spring plate assures firm contact and flat plates provide large area contact. Warped plates would give line or point contact which wouldn't have as good a current capacity as flat plates pressed together. If you have to improve contact pressure in a clone connector, try bending the spring plate to increase the preload force.
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