Just forget about default ATC. The bugger is so bugged, it's bugging me that people keeps using it regardless.

Reconcile yourself with the fact that M$ does not care about it and only puts it there for show, and put it behind you. I know I did. Been almost, what? ...three... four years maybe? ...since I last used it, and ever since, while flying off-line, I make my flight plans and my procedures using maps on the net or improvising with the help of FSnav when maps are unavailable... and, you'll never believe it, never had a problem anymore.