Question #1 - I dont listen to that feed, but there should be a "contact feed provider" link somewhere on the feed page on Broadcastify. You can use that link to send a message to the person hosting the feed. Sometimes they don't respond.
Question #2 - I don't use an HP-1, but the data in the HP-1 is the same data we maintain in the RR database. There are lots of reasons that it might not have worked, and we might have been able to trouble-shoot it with you if you had posted a question about it while you had it. Setting the correct location and range, ensuring you had the correct tower site selected, ensuring that the data in the scanner was up-to-date, etc. It wasn't so long ago that CFD moved from the Charleston City trunked system over to the Palmetto P25 system used by the rest of Charleston Co. You might have had the wrong system/talkgroups selected. And maybe you were in a bad place for reception - consumer-grade scanners nortoriously struggle to monitor P25 simulcast systems like the one used in Charleston.
Sorry for your poor experiences. Although RadioReference and Broadcastify and the scanner manufacturers have made great strides in making the technical aspects of this hobby easier for the lay person, this hobby strill requires some patience, persistence and technical proficiency. The radio systems we want to listen to are more and more complicated, making our tasks more complicated.
Have you found another radio to use? Uniden has some new models on the way with some innovative features, and Whistler is reported to be working on some GRE-like (or exact) models soon,