Your CMS seems properly configured and you could ask an avast team member to excluse your domain on that IP,
also ask your hoster Krystal Solutions LLP to mitigate you from that IP or take down the abusing domains.
Consider: http://urlquery.net/report/61d23545-fa53-443d-975f-153c995708b6
You have to wait for an avast team member’s reaction here, as we are just volunteers with relevant knowledge
and only avast team members can come and unblock,