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Thanks for your traces, I took a look and I'm under the impression that your provider is using Carrier Grade NAT (as you say native dual-stack costs extra) and that the first hop in the provider network has some issues.

The ICMP administratively prohibited messages indicate the device that is restricting your IPv4 access and if we can say for sure it is a device under their control, then supplying them with the packet captures should make the investigate and solve the issue.

Could you make a packet capture while you do the following?

1. traceroute 8.8.8.8
2. ping -R 8.8.8.8
3. A web visit to https://www.myip.com/

Also, could you

1. tell us how you are making your packet captures?
2. The WAN ip address of your FB7560 (and does it change when you reboot your router?)