Ive just gone with foregoing the "reset" normal after a rekka string and letting the opponent hit the ground to set a Left/right mix up using the teleports. It requires a bit of reading, but nice rewards imo.
Havent been able to really test it that well, so Im not sure how safe it may be. It does criss-cross up though, making reversals harder to do.
Examples:
Rekka string, (no delay) qcf+b, opponent rolls,(no delay)qcf+b = you criss-cross them up.
Rekka string, (no delay) qcf+b, opponent rolls, (delay) qcf+b = you look like your gonna cross up again, but dont and wind up in point blank range.
then theres other thing you can do if you delay the first qcf+b, and such. If you dont read it right and they DONT safe fall, then you just fly past them back to half screen. Of course if they dont tech, then you can still mix up from there.
which I had the capacity to make videos. this shit is hard to explain in words.
Most of this is just Lab-work. The people I play with don't really safe roll. lol -_-