I'm not sure if I interpreted your fingerings right but using finger 1 twice in a row is a bit of a slowdown here.
This part is really bugging me, I think I've tried almost everything but nothing feels good.In bar 8 I've used (5-1)-2-1 (5-2)-1-2 (5-2)-1-2 [etc, ascending]When it comes back from top [5 on C, 2 on E]; (5-2) - 1 - 2 - (5-1 [the octave]) - 2 [and the rest is trivial]The problem with these fingerings is that I don't get it to flow seamlessly because of the jump of finger 2 from end of sequence to beginning of the next. Bars 8 and 9 are really the problem, and I'm starting to think (5-3)-2-1 for ascending is the best solution despite it's painfulness. Still, I'd rather figure out a "nicer" way of doing this...