I don’t so much think it’s a different charge time. But more on the input aswell. I noticed some characters are very finicky about their inputs whereas others aren’t.
For example, with Bison (Dictator), I was getting really irritated with seemingly inputting his ultra correctly, but getting teleport instead. I went onto training mode and did a comparison of inputs of when I get teleport and when I get ultra.
The result, was that I have leniency in that I can charge down-back. But the end result cannot be down-forward, it must be directly forward at the end of the direction input. Otherwise I got the teleport.
Chun Li and Balrog however seemed to have leniency in that you could end on the down-forward marker and it would still come out.
It could be that some of Vega’s input (like his RCF, I can never do it amazingly consistent, but I chalk that up to my own failures because I have problems with Psycho crusher with Bison). has this same effect, but I wouldn’t count on it, since he appears to have leniency for his FBA, SHC and ST.
Not sure if half that post helped on anything XD