PDF Export - How do I resample images for 25% print?

Using OSX 10.6 and CS3 504.
I've built 6x large format pages at 1885mm x 600mm that will be printed on an HP5500. Content includes text, images, and objects with fills/strokes etc. All images have been resampled in Photoshop to produce an effective resolution of around 150dpi for printing at full size.
My printer is going to do a test print for me, at 25% final size. He has asked for images to be no less than 100dpi for 100% output. He has asked for Generic CMYK so I'm using the PDFx1a2001 preset.
As recommended on here in a previous thread, I've placed each of 6x pages of the 100% PDF (75mb) into a new document and scaled each down to 25%.
I then export to PDFx1a2001 again, and the resulting PDF is 45mb.
My question is, how do I give him the most efficient file that will:
take ages to transfer to him
not be too large for him to process
give me good enough quality to see how things look.
Do I need to change the resample numbers in the PDF export dialog? Or should this be OK?
Many thanks.

You can print the original PDF to a PostScript file at 25% and run it through Distiller if you have it. But I would just export a 100% file with images at 25 ppi and have the printer scale down when printing.

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PDF Export - How do I resample images for 25% print?

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