I felt like asking here since there are a few Stepmania experts on here (read: Kingdaro) who know how to play really hard charts, but I've been trying a lot and there's some charts I can't really do.
Here's some examples of hard charts I've played - around 16s - 18s (dr. fetus flipping you off = failed song):





The percentage = how much I got, and the blue (or red) numbers is the difficulty.
I'm playing using spread(?), left is D, down is F, up is J, and right is K.
I do have trouble with streaming (and patterns) at some point, but sometimes the BPM is too hard to catch up with.
I've played for a while, can play these sometimes with enough practice, but what do I do to get better? Play more? Play less difficult songs to practice?
Let me know, I would seriously like to improve on this game.
Oh, and if you want the theme I'm using, it's for OpenITG and In The Groove (dedicabs),
theme is right here.Screenshots here as well.