Sorry, I've been out of this game for a long time. :(
And it seems the old Steam Community forums are gone. Pity, there was a thread where people ran an unofficial weekly challenge, which was a mine gold of information.
Have you tried simply googling for the maps you have troubled with ? There were a ton of videos available for the first game.
If you need pointers on some map, or general tips, Miendiem had a few interesting videos:
https://www.youtube.com/user/miendiem/videos?disable_polymer=1
You could also try the current community forum: I believe Astranine is still active, he could show you some of his setups.

Could you do a walkthrough like this for all the normal story modes? I've been having trouble getting anything other than copper results on some of the levels. Not even necessarily a video, but maybe even a screenshot of each level with the best maze setup.

Thanks!