I was literally about to post something about single vs alternating tapping.
Can anyone speak from experience (if you're mainly a single tapper) whether or not your single tapping speed ends up increasing? I'm pretty much a single tapper myself, but if I play something like Image Material, even the singles feel too fast. And yeah, I accept it's also a reading + aim issue, but even if I were to AR9 edit it, I'd be willing to bet it's still a single tapping speed issue.
That's not my way of saying I want to play Image Material, I just used it as an arbitrary example.
EDIT: Damn, Image Material was such a bad example lol. I've played the map once with No Fail. I can't think of another example though. I just remember playing it and thinking: "Dude forget the streams, how the fuck am I going to ever hit the singles?"