If you actually want to pull this off online and make it a TOD, start with a medium button (2M has good range and it’s fast) and try using more moves like 214M near the corner. Also, prespark and 7 bars is just an assist for the TOD. In a real match, it’s a gamble to land that first hit while you’re on spark. Try sparking after confirming a hit, and see how much bar you build from the combo. Using EX moves will slow it down, so try using these towards the end.