All right, I don't care about double posting, because this is a big deal. The issues I was having with the lightmap import process seem to have fixed themselves after 5 days of experimenting, and I'm going forward as fast as possible trying to fix all the remaining lightmap uv errors. Here are some screenshots of the fixed areas. Nothing is final, and I'm always seeing little glitches here or there that I need to fix. Hopefully these will be good though.

Half the time it's not just fixing errors, it's raising the resolution and making important areas higher-res than areas of lower importance. Take a look at the shadows and shading for examples of this.







Look, shadows! And shading!