popoblo: sorry I never responded to your PM.
Well, I’ve coached a lot of people through RCing and I found I kinda have to be there to see what you’re doing wrong. The best advice I can give you right now is to go to the training mode and be sure to turn on the key display.
Turning on the key display will tell you exactly what you’re doing wrong. If Iori’s rekka is the example, there’s basically 2 possible wrong outcomes:
- You get a plain roll. This most often means either A: you’re RCing too slow, or B: your motion is too sloppy. Again, check the key display. If it shows (sorry, gonna use number notation here to save time):
21(roll)4+p or 2(roll)14+p
If your key display shows the above and you only got a roll then you indeed did the motion too slow. Anything else, and your motion is too sloppy and missed some inputs. Most commonly, people either accidentally miss the diagonal or hit the punch too early.
- You get a plain jab rekka (or even worse, the Running Grab). This is mainly due to sloppy inputs also. The most common mistake is doing:
214+roll, then fierce
People ALWAYS think they’re hitting the roll way earlier than they actually are. If the above result matches yours (as it does for 90% of other people learning RC), concentrate on hitting roll earlier; like hit down+roll then finish the motion.
The other way of getting plain jab rekkas is by accidentally negative edging it. If your motion looks correct, like:
21(roll)4+p or 2(roll)14+p
If your key display shows the above and you still get plain jab rekkas then you are definitely negative edging. Try holding down the roll buttons to help prevent this.
That’s what I do for qcf motions. For some reason, some are MUCH easier than others… notably Sakura’s and Yamazaki’s.
For hcf/hcb motions you have to swing the stick quite a bit faster then for qcf motions to make the requisite 3 frame window to RC it. I try to hit roll at the very first input (but for some reason on the key display it will always show the roll and the 4th input).
There are a few ways to do sonic boom RCs. Some people do them as half-circles, some go from straight back to straight forward (make sure to hit roll VERY early), and some hit roll early and hold the buttons, move the stick forward, then let go of roll to intentionally negative edge an RC jab sonic boom.