What's the A3 equivalent of the scansnap ix500?
About the editing process, sorry but all the time that I would dedicate to it would be less time dedicated to the scans. In an ideal world I would have infinite time and scan everything at 1200 dpi with a professional flatbed scanner and accurately edit every single page. But I think that the current "quick and dirty" approach with an ADF scanner is ok enough. Having something not ideal is better than having nothing at all, and that doesn't prevent the possibility to have better edited scans in the future.
I like it to compare this to the emulation scene, where people started to develop the first scrappy emulators and ripping games in the 90s, but it took several years before the preservation and accuracy mentality caught on. The early projects while far from ideal where the foundation on which the later contributors provided the better experience.
I'm doing what I can, if tomorrow someone will edit/provide a better scan, kudos them, everyone will benefit. I'm just an individual with limited resources at the end of the day and compromises must be made; currently I decided to spend these resources on the scanning process alone since I'm the only one with access to these magazines and willing to scan them.