I've decided to shift from PDF for the Sony reader to EPUB instead. I still have some more testing to do with page numbering. Currently I use a single .xhtml per approach plate, which makes some things a bit slow, but not as slow as a single .xhtml.
The EPUBs are processing now and will be uploaded in a while. The Dec 17 cycle is the last with Sony PDFs.
I've tested these approach plates on the Nook emulator and it appears to work. I won't have a real Nook for a while to do full testing.