the title pretty much says it all. I can slide almost every single rail, except for flat-downs and battleships and things like that. any thing i might be doing wrong?
trial and error is likely your key, your gonna have to learn to compensate for the kink and shift your weight its hard to explain any specifics on how to do it you just have to keep trying
slide the down like you would regularly, anticipating the kink, when youre about to hit the flat adjust your position so youre body is perpendicular to the slope of the rail.