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Great writing skills OP. It's too bad that you aren't able to progress consistently, but I defitely get you.
Personaly I have the same problem with drawing. When inspired I can come up with great ideas and just draw, but when I can't picture the idea I just can't create anything. And like you, forcing it results in mediocre crap.
Anyway, keep working at it, this is great stuff you're putting out.