What is the result after testing it with the ping tool?
have you tried the other pool from ckpool if the ping result is high you can use the other suggestion only if your ping is high.
IPV4 is solo4.ckpool.org
IPV6 is solo6.ckpool.org
Just don't forget to add the port :3333 when testing.
When I use the tool it's under 100ms, which seems better. It floats around 85ms-95ms.
I haven't tried any of the other pools. I should look in to that and see if there's any difference.