The best place to look for info on stripping Adobe DRM is Apprentice Alf's Blog, which has a post on "Adobe Adept".
Once your PDFs are DRM-free, xpdf is an alternative to mobile ADE on the Pocket Pro. In addition, you can try converting from PDF to ePub (say) using Calibre. This uses another implementation of reflow (for the entire PDF, rather than the one page at a time approach ADE uses) and it might do better.
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