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I think another reason Bach wrote so many fugues is that, if one comes up with an effective and pleasant subject, the piece almost writes itself. Having the skeleton of the exposition, entries and of the subject itself provides a firm framework for composition; it's precisely this desire to be able to write a lengthy piece from as little material as possible that led to the development of the Sonata form.
In terms of clumsy moments, I'm not necessarily referring to moments of harmonic inappropriateness, rather of weaker voiceleading and counterpoint. Sections like the bassline is bars 13-15 stand out in particular, as does the use of the augmented second in the minor scale (perhaps consider leaping the octave to conceal these).
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