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It might work if you use rqt_reconfigure to set the parameters. I took a quick peek at the dwa_planner code and didn't see the max_vel_x setting by rosparam.

You can find it here: https://github.com/ros-planning/navigation/blob/a9bc9c4c35a55390963db1357926ec461fcff24c/dwa_local_planner/src/dwa_planner_ros.cpp #L97

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