You didn't give much info, such as whether or not you really
have a fixed IP address. I'm assuming you do.
The drop-dead on traceroute(1) seems normal, well, at least I'm getting the same. If I'm reading the domain name properly, it's hinting at Houston Texas as the last point where a border gateway/firewall responds.
Other than contacting PG directly and taking some of his time, there's really no way to find out if there's an IP/subnet ban in place.
If your ISP is doing something dumb (bad caching), then one possible answer is to use HTTPS rather than HTTP.
If someone using your ISP is doing something dumb (running a scraper), then you're probably stuffed.