+A~C not just any punch.Not in HD mode, you have to do
f+A,
+C, f+D and yes you have to fairly low to the ground for the followup to work.If you are getting the DM, it means that you arent doing the
f properly (where you arent hitting the 'Back' part where when you do
, it acts as
x2 instead), or you doing the motion unnecessarily too fast. Slow down your motion of the
f and the
and you should get results.Meanwhile, here is my latest vid
I also do his stun combo with inputs. You can kinda have a look at how its done. Funny enough, it registered as me NOT doing the 'back' in
f motion, yet it still comes out. Haha, hypocrite I am 



, thanks