Synchronizing Hands in Bach -- e.g. WTC BK I prelude No. 2 c minor

[glk]

Hi:

Based on a thoughtful comment I received in the Audition Room -- see http://www.pianostreet.com/smf/index.php/topic,21317.0.html
I'd appreciate suggestions for improving the synchronization of my hands in playing
intricate or symmetrical passage work.  My own thought has been to
practice slowly, with different rhythms, and then with metronome at increasing speed. 
I also try HS, especially if I can tell which hand is lagging and needs to be solidified.

Suggestions for a more efficient or alternative approach?  Thanks.

Gary K