Not sure what to tell you buddy. That def. is a brutal beat.
I guess moving down is the correct thing to do, if you don't feel comfortable with those kind of losses. Maybe win some more and get your bankroll bigger...then try again..? It sounds like you're playing fine but just hit a bad streak.
If it makes you feel any better, I've lost 5 buyins in four hours on Gaming Club earlier this month.. On Party, lol..well...we won't go into that. There are certain reasons I left that place, varience sucks!!!
Good luck!