Well here is my 2 cents, but slow down is the only i could say to... help you truly...
but a method of fixing up your fingers and training to slow them is what I did for my control scheme...
if you don't use L for anything set it for "Special"
now practice timing the dance, slow down, and make sure to complete the dance.
don't bother with up combo and down combo right now.
Just master the rhythm right?
Okay I told you to set up the L for special because... if you're like me... i begin to mash B when under pressure and then DB just screws up and i lose and hell breaks loose.
But... basically you have two buttons working on "special" one which is L and as wierd as it sounds... you don't even have to implement it to your style... its a safeguard when you (i) realize that you're (i'm) mashing B, and failing DB... its just a reminder to take you time
since L "special" is a lot more awkward, the timing is a lot better to time (since you'll have to think it through)... but later on it gets too awkward, and quite difficult to pull Up combo and Down combo... When you can start doing L "special" then start alternating the two buttons for to check if you got a pretty good idea of the rhythm needed for a successful DB... and then finally just think you're pressing L and you'll just be using b...
that's all i can really tell you, i'm no good at helping since I'm not that good... just what I did to work on my DB y'know.
Sooner or later, when you get good at starting the combo and just timing B... start implementing up and down... and it'll be awsome
Good luck
. Can someone give me some pointers pls.