Yo dawg, chopin2015 here.
The only way to get good at Bach is to play Bach. Just as the only way to play Beethoven is to study a whole bunch of Beethoven. Find out how many times a day he pooped, then IMITATE it. (Wow, we weren't really talking about fugues, but hey!)
Find one you like (I'd pick something medium length, or a couple of short ones) and look at it away from the piano. Visualize it, hear it in your head, then go for it, whatever it is.
Essentially, the hardest part about Bach (besides playing musically) is definitely the rhythm. It has to be so exact. Metronome practice doesn't fix everything at once, so that's why I say working on Bach to play any Bach is essential. It is a journey, not just a piece you learn. To learn a piece, you learn the style of the composer, not just the genre of music.