FAST_LIO

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Hi, I am using fast_lio with ouster in humble. I am using ouster pointcloud and built-in imu, but it is showing poor mapping results. What exactly do these parameters mean, how to use them, and are there any recommended parameters for outdoor use? How should I adjust them?

/**: ros__parameters: feature_extract_enable: false point_filter_num: 3 max_iteration: 3 filter_size_surf: 0.5 filter_size_map: 0.5 cube_side_length: 1000.0 runtime_pos_log_enable: false map_file_path: "./test.pcd"

 And additionally, even if we use the internal imu of ouster, do we need to calibrate the two through an external algorithm?
 Please help me,,