bitbased

Not completely sure if it is the problem, but srfprograde is not the same as orbital prograde so maybe you just want prograde. Also rotations are euler rotations, so order can be a problem, but shouldn't e the case here. something like AngleAxis might help, but regardless the documentation page has all the details on kOS rotations https://ksp-kos.github.io/KOS/math/direction.html?#function:ANGLEAXIS .