To clear this up, it has nothing at all to do with what size your layout is. Redoing your layout has absolutely no impact on what your *published* JPG size will be.
To upload to the gallery
1. Create your layout however you want. It can be any size. 8x8, 12x12 - whatever.
2. Go to File > Publish to > Images.
3. Choose "web/email" in the size box.
4. Publish your JPG images.
5. Upload to Gallery.
6. Success and happiness!
Scrapbook MAX! 2.0 is here!. It's simply better digital scrapbooking software!