Originally Posted by Headfoot
(...) and you'll never get past 140bpm if you don't do heel down. I'm currently trying to fix heel-down accuracy, power, control on my left foot to break past the 140bpm barrier.
What are you talking about?? This might be your personal experience, but why generalize? I'm maxing out @ 250 bpm heel-up (16th notes, singles) and don't play/practice heel-down a lot (I'm rather poor at heel-down). So I absolutely can't see how your statement can be accurate. Those motions are different things to practice. There's some interrelation but not too much, you have to practice them individually.
Also, I had to edit your language...