Prepare you anuses folks.
I found that doing this OTG is easiest to do after doing a F3 ~ Trait ~ D2 ~ RMS Forward 2 into the MB SP. It unfortunately can't be used after the normal OTG setup I would go for because you have to MB SP at the same moment the opponent touches the ground and unless it is done at the beginning of the combo, they will fall too fast. The vid I posted shows optimized damage that I could find so far. I'm not sure how else it would really be useful in a match but it's stylish as fuck either way so you know I'm gonna use it