by the way, I noticed there's some caching going on at the mappingsupport.com server with my GPX files and even when I update them, I keep getting the same track that was first displayed under that URL. I now have to rename all these GPX files to new URLs to get my changes to display, since apparently there's no second download ever, even if file dates have changed.

See the very same track renamed to a new file here - this now shows the edits I made several days ago - focus on those "fuzzy" areas where the GPS was scattering around during breaks. They are not part of the GPX file any longer that the above iframe pulls in - the track should look smooth like in this link:

same file, different name