corwin, to make things bigger convert using a different layout, such as landscape or quarters-of-a-page. When converting with landscape, put the Reader into landscape mode as well by holding the Size button for 5-10 seconds.
In fact, the default mode is landscape. If you convert using this mode and then do not put the Reader into the same mode, the text will look very bad. Hmm.... I think I should change this behavior. I wonder how many people tried pdfrasterfarian and thought it did a horrible job... Also, I wonder how many people didn't think to use landscape because they thought it was for landscape documents. Ugh. Alright, I'll work on making the relevant UI screen much clearer.