So, I started running through wedding photos and saving as JPEG. Big mistake. Seems what is required is the Digital GEM, which is the grain remover — as the JPEGs are very, very grainy. Plus, with the GEM, which makes the picures better, they also compress by another 3-4M! So, less grain = smoother color = better compression. So a win all around!
But this means I gotta re-scan a bunch of pages… blarg.