In bar 21 I think the quarter-note Bflat after the trill should be held all the way until the B natural, preferrably with the left hand being released about half-way. It creates such a beautiful effect, I think. Have you tried it?
There are places where one has to find a trick or two, for example bar 80-81. I'm planning to do a little "artistic" ritardando there, which seems to work well. Alternatively, one can try to play all notes, c-eb-g, with the right hand so the left hand can move calmly to the next position.