Glad to hear you liked my suggestions! Send me a friend request, let's play sometime. That aerial DD you described reminded me of Gill's ridiculous Jesus super, seen at 0:23. That's why we should copy & paste it from 3rd Strike and give it to Tager. Chip damage that deals 50% ALL DAY.
Inferno Divider beats Magna Tech Wheel for free, and I've seen Ragna players use it to escape Carl's throw loop; throw break, Inferno Divider, RC, barrier guard and land safely. I doubt that's guaranteed, probably a mistake on Carl's part, but either way, Inferno Divider is just really useful, particularly as a "get off me" type move.
I should have been more specific with the kind of invincibility I wanted, sorry. I was thinking that it would work like 360+A, where it's vulnerable until frame X, then invincible for a short period of time, then vulnerable again. I think that's pretty reasonable. That, or leave it the way it is but make its "catching" hitbox a lot bigger; that way it could still get stuffed, but it would beat most jump ins if spaced properly.