Sorry, I'm still unsure if TCAdmin has any relationship to the drop off my server has, but since switching the popularity of one of my servers has been dropping significantly.
There is nothing in the server log that would indicate a problem. I also did a query into the Steam API to see if the server is listed okay and it is. However, some people tell me they can't see it, I can. Some people see it fine as well. We do have a software firewall "ConfigServer", but it is the same exact setup we had with cPGS with no issues.