i dont play at nearly those stakes, but it might be the case that you are still trying to play as though it were a 100nl table. making the standard 100nl moves may not be as effective at 200nl. the players that you are up against at 200nl have probably also crushed 100nl before moving up (for the most part). you may need to alter your play; less c-betting, fewer moves, more straightforward poker; until you get a better feel for the way the game is played at that level. then you can start to open things up more. this tightness will have the added benefit of reducing losses while getting used to the new level.