Welp, seems like my old account was nuked. I barely posted in the past so I doubt anyone remembers me here(hell I forgot I had a dustloop account). Time to create a new one!
Hey younghou, are you from chile? Do you use viper in usf4? I'm from peru
Well after the RC you have an airborne opponent and no meter so you can go for simple stuff(5H or 6H into heat knuckle into extend or other knuckle if applicable), some fancy stuff like walking forwards a bit into 6H into HFB into 2S into heat (or into 6K into heat) or try to go for a 6K loop. It all depends on your opponent and how high you start the combo after the RC.
I don't know if there's a more damaging option if you go for the 8D version, but if you go for the 6D there's plenty of damage to be had, like that 100% combo on zato after a 6D that was posted some posts above by Jakestation(link here).
Some guy said that it works on sol and slayer, I don't really know. Maybe you can test it in training mode and post the results?
EDIT: And going into 6K loops I found this video very helpful: https://www.youtube.com/watch?v=PVk5kj5rgas