Heh, I feel you brother.
English is just sooooo much better than my native tongue. My head voice is in English, I dream in English, I speak to myself in English, and I forced couple of my friends to speak in English-only. And of course, 95% of what I see/read/hear is in English.
As a logical consequence, communication with outsiders (of my group) suffers, as I am unable to express my thoughts in my native tongue. A bit odd, but I don't give a fuck, I don't want to continue living here any longer.
As an advice, turn them to English, or simplify the topic.