Yep, TT is totally inaccurate as it doesn't use gl=us (to get local result, so a proxy is required) and they refuse to change it because gl=us causes problems for their customers, apparently!! That really makes no sense for when searching US results (how can it be a problem). It's potentially a good piece of software, but too many bugs (doesn't work with VPNs, doesn't find anchor text, as well as the poor job of rank tracking). All I can conclude is they are doing a bad job at URL construction for the query, something as simple and stupid as changing the domain extension rather than using gl=country code.