Instead of doubling the bar amounts, you can also just change your TSIG setting to 8/4, instead of 4/4. That way you just have your bars twice as long, but playing twice as fast (double tempo) instead of making 2 bars (on the MPC) sound like just one.
In case that was confusing, heres a diagram:
4/4 example (2 bars):
1___2___3___4___
K_______S_______
K_______S_______
8/4 example (1 bar):
1___2___ 3___4___5___6___7___8___
K_______S_______K_______S_______
So basically, the longer bars makes a more natural feel. One bar will still equal one bar, with 4 beats per bar because they technically play twice as fast. You'll hear 8 ticks per bar, but each pair of ticks now corresponds to one beat (top and bottom).
To sum up what I'm saying is that if you double the tempo AND double the TSIG, then you get double resolution without changing the number of bars you have (so when comparing beats you don't need to do math with the bar quantities) or altering how you would normally play, except the increased metronome rates. There used to be a tutorial about this, but the Tutor has smartened up and ain't giving the sh!t away for free no more

, so I suggest to everyone to drop the $40 and get the ebook, 'cause this cat's got KNOWLEDGE!!!