The ping plot isn't too bad to be honest, even with using mobile Wi-Fi , did you try the leatrix fix at all ? was the ping plot done when playing ?
you could try using a VPN to see if it makes any change at all, www.wtfast.com
offer a 30 day trial, worth a trial even to see if it does/doesn't help.
Others have reported issues to EU recently though and may be related.