this isn't much help to you, but after endless frustration with mess and large steps between grind settings, i gave up on the 0480 and invested in a breville smart grinder (bcg800). only had it a week and i'll never look back. almost zero mess and each increment is a lot smaller jump so you can fine tune the grind much better. again, sorry that doesn't help your situation. the top burr on my 0480 looked like yours does. i used to occasionally get the same thing where it would be fine, then next time it would choke the machine, so you'd adjust the grind and then have it way too quick and after fiddling around you'd basically end up back where you started.