What's that people you are calling "bricking DS mode"? Does this consist on actually leaving DS mode unusable or you are just trying to say that the DS profile hack got messed up and you had to reapply the hack again?.
DS mode stops working, if the ds profile gets corrupted too badly. Actually, I'm pretty sure it can only happen if the checksums are incorrect, in my experience. Anyway, the only way to fix is a system format.