Try to find the right rhythm. Set the sound a bit harder than usual and try to follow the music of the combo. When you hear the rhythm it because much easier to perform. In my opinion this move is way too hard online with the netcode and all.
If you're a cutthroat and got someone in the corner: B312, 32, 4 (or F4), BF3 works like a charm online.
Or if you want to spend meter with Cutthroat: b312, 32, exDB2, 4 (or F4), BF3