TEB planner always uses a fixed turning radius

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I am trying to use teb planner in my navigation stack. However, while turning at the corner, it seems that the planner always uses a fixed radius and lead to a collision, then start rotate recovery. I tries to set the turning radius small but it does not work. I want the planner do a quick turn to avoid the obstacles. I tried to change the inflation but it doesn't work. Does anybody know how to config the planner?

I am using a turtlebot, controlled by diff-drive.

Here is my teb_local_planner_params.yaml and riviz screenshot.

https://github.com/zhaoliangzhang/For...

The green line is the global path and red one is local path.