Slideshow - low photo quality and resolution

In AP3 and slideshow mode I have tried to make some slideshows, but the images are of low quality and resolution. I guess this is due to my previews setting of 1680 x 1680 with a quality level of 6. By increasing the preview settings to 2560 x 2560 and quality 9, the images in the slideshow seems ok. But the increase in quality increases the size of the library file. One can choose to only apply the increased quality settings only to the images in the slideshow and then go back to the preference and change to the default setting of lower quality, but I find this rather cumbersome. Any solutions to a faster workflow?

As you have figured out, Aperture unfortunately re-uses the Preview image settings for its slideshow images. There's not much we can do about that short of waiting for an upgrade to give us the same quality settings for Slideshows as it does for any other type of export. That said, however...
If you're concerned about Preview storage requirements (totally legit concern, since it affects preview loading time) the "Preview photo quality" setting you choose in Preferences->Previews can have a huge effect on file size without much perceptible change in quality at the higher settings. For most images, for instance, I can't tell the difference between a "quality 7" Preview and a "quality 10" Preview. Yet the difference in file size can be a factor of 10! That's much bigger change in file size than going from 70% to 100% in pixel resolution alone.
So I'd suggest you err on the side of larger resolution but (slightly) lower quality previews to retain maximum detail. Do your images typically reveal the difference between quality "9" and "7"?
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