Ballade 2 - Coda

[dbrainiak914]

I've been working on Chopin Op. 38, and I have most of it down.  Except for the coda.  This thing really is a beast.  All I've been doing is playing it slow and speeding it up, but I can't get it past a certain speed without my hands losing control.  What are some tips for this crazy thing?  Any other excercises or small pieces that can help me with these constant 16th note chords?  Also, the arpeggios are giving me some trouble (the B7-cdim-am-E7 then B7-cdim-c#dim-ddim ones).  Thanks!