While this is a really cool looking EX custom combo, I find it 1) very impractical 2) broken by a jump 3) too weak to justify the loss of 100% meter.
Do this at the end of the round where every little bit of damage counts, if it comes down to it or if forcing a guard break upon your opponent. On a run with this, you can break about 20-25% guard meter. If you are going to use this, use it up close against your opponent, if you give them time to jump, your meter is wasted for nothing. The range of the 8 is fairly large, but can be anticipated by any jumping opponent. Overall, I highly disprove of using this anywhere in an actual fight whether it be casual or serious.
After messing around with this a bit, the highest damage I could get from a full combo is 2700, any of Ryougi's other B&B (meterless) pull damage output of at least 3300.