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30-50 kb/page is the unavoidable result of converting to images. The difference in the "increase factor" simply has to do with how much non-text data the pdf contained. Output size stays consistent, input size can vary widely. Most people, however, find that 30-50 kb/page is less than what their original pdf took up. Nevertheless, a completely text pdf might use just a few kb per page.
These days, however, a 1GB sd card costs about $10 (with 4GB also available) so none of the above should really matter.
About the blurry text: Ashkulz chose not to implement the sharpening filter found in PDFrasterFarian. You might want to try the other program and see if you like the result. The possibilities for post-processing, however, are vast and few have so far been explored. If you have any suggestions, they would be welcome.
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