Sixteenth note passages in both hands

[qoppa]

Hello all
I'm currently trying to learn Bach's Sinfonia no. 15, an I seem to be having a remarkable ammount of trouble with the 32nd note flourishes when they're played with both hands.  I can play both hands fine seperately, but the second I try to combine them, I can't play them accurately, even at half speed.  If I had to pick a technique that I find the most difficult, this would be it.  Does anyone have any tips on playing passages like this?  Also, can anyone reccomend some pieces that could act as a stepping stone?

Thanks

[desordre]

 Dear Qoppa:
 Although I know that there are different approaches, I like to do as follow:
 - given the fact that you are able to play HS about 130-150% of the final tempo, try to join hands without metronome as slow as you need. Don't mind if it's, in the first attempt, very slow. As soon as you can play them together, speed up with metronome. Pay attention to one thing: after you can play HT, if you continue to play very slow you may develop a speed wall.
 Sometimes, it helps a lot working with very little parts (a beat, or a bar). Good work to you!
 Best wishes!

 PS: By the way, most of this I got from one of the fellows here: Bernhard, thanks again!

[qoppa]

I can't play 130% of the final tempo yet.  That may take a while still, as the passage, although regular, is kinda tricky.  Once I can though, I'll be sure to do this as it does sould like it would work.

I'm also still looking for some pieces that have similar passages that may be slightly easier to play.  Pieces that would be nice and easy to practice this technique.  Perhaps some of Bach's Inventions?