Idle Timeout not reflecting when Changed from Default 300 secs.

I changed Idle Timeout form 300 secs to a bigger value mainly followed below steps , but when traffic is following through F5 , user is seeing timeout in around 5 mins when they check directly from Pool member it is more than 5 mins. 

What wrong I am doing  ? How can I validate this ?

https://my.f5.com/manage/s/article/K7166

Creating a new protocol profile that uses a different timeout value

1. Log in to the Configuration utility.
2. Navigate to Local Traffic > Profiles.
3. Click the Protocol tab.
4. Click the relevant protocol profile. For example, FastL4.
5. Click Create.
6. Type a name for the new profile.
7. For Parent Profile click the parent profile you want to use.
8. For Idle Timeout, select the Custom check box.
9. Type the new Idle Timeout value, in seconds.
10. Click Finished.
11. Navigate to Local Traffic > Virtual Servers.
12. Click the virtual server to modify.
13. For Configuration, click Advanced.

    Note: For BIG-IP 11.5.0 and later versions, clicking Advanced is no longer necessary.

14. In the Protocol Profile (Client) box, click the new profile you created.
15. Click Update.

    The virtual server now uses the new idle timeout setting.

     

     

16.